Consider aiming to avoid the surgery if possible - there is increasing evidence that hernias can be improved in part or in whole through non-surgical means (though only the more elite and well-researched surgeons are aware of that fact at this point in time). Many traditional cultures used abdominal wraps/cumberbands to enhance core awareness/strength and heal weaknesses and actual hernias when needed. As you prob already know, any surgery that cuts through the body’s protective layers is major, and life-risking, and one must assess the real risks and advantages/disadvantages both short term and long term.
As others have mentioned, basic surgical recovery is… gruesome… and surgical complications are heinous… Plus, surgical errors/mishaps are another part of the equation (iatrogenia, etc). The fact is that abdominoplasty opens the sealed core of the body to chill along with risk of infection (at a rate of around 40% depending on various factors). Ironically, surgical abdominal repairs further weaken the connective tissues lifelong apart from the short term quick-fix stitching or patching etc. The rate of hernia re-injury and repeat abdominoplasty surgeries is also significant alas 
(If I recall correctly, it’s something it’s between 40- 70% in males, with the higher rate in older males, but still not a small thing for younger males as there is still a frequent repeat surgery/complications - as is the case in many non-emergency interventions). So, you might want to consider giving yourself more time to explore your options and healing regimens and postpone the surgery date.
The umbilical area/core armor is the seat of personal power in the body - and many people who’ve grown up within chair-sitting and otherwise mind-body disconnecting industrial culture and malnourishing SAD diets have weak bellies/cores. The natural umbilical hernia that all babies have is supposed to go away by around age 2 - but in some children it never entirely closes or it remains somewhat vulnerable (due to poor nutrition and/or injury) - and often further injuries/accidents and/or training overexertions in later life play a role in separating the connective tissue/linea that comprise the abdominal support corset.
I’d def recommend getting second and third opinions on healing options from people who aren’t surgeons - as well as surgical prep options (in case surgery is actually required). You have a relatively small hernia (some are 2 inches, some post-childbirth ab muscle separations are more than that, etc), though certainly all hernias are critical to attend to - and you are young. These factors bode very well for self-healing using splinting/bellybelt and the specific, intense, connective tissue restorative exercises - plus incorporating daily collagen intake + Vit C for tissue repair nutrition. 
Check out senior abdominal healing specialist Judith Tupler RN PT’s non-surgical program for hernia healing - it’s evidence-based, medically-blessed - and is an 18 week program that involves basically nearly 24/7 splinting (with comfortable patented gortex ab support for muscle/tissue bringing together - NOT compression) + rigorous daily belly/transverse seated exercises/contractions that are phenomenal for neurological/electrical recovery in the area of injury, and the general connective tissue/faschia in the belly. It involves taking a break from other training for the first 6 weeks in order to get established in the program - and then incorporating the belly-protecting awareness and splint while proceeding with one’s normal workouts. The entire program takes dedication - but is actually time-saving compared to surgery’s post-op realities plus the fact that no one is ever guaranteed to return from general anesthesia/the underworld to actual worldly time again (even though it may seem like just an adventure of sorts … which it did to me as I myself had a tonsillectomy at age 4 and a broken finger surgery at age 15, both of which I later found out were actually unnecessary, and the some others regularly didn’t survive or had post-op complications from - and which I wasn’t prepared for in terms of the excrutiating and awful post-surgical realities for weeks on end - some 200-300+ hours of nonstop pain, serious meds that were harsh on the liver, and other new incapacities before “recovered” with scars, etc).
These things aren’t much discussed in industrial culture - but are real. She also has book called Together Tummy, which contains her program, and many youtube training vids - and hasa video just for dudes that takes you through her program and doesn’t include all the female/pregnancy-related stuff.
Also beneficial is the work of biomechanical physical therapist Katy Bowman - she has a book Diastasis Recti: The Whole Body Approach To Abdominal Weakness And Separation is all about core/umbilical strength restorations for both injury and lifelong self-care. It educates on the connective tissue, and on postural recovery of proper rib placement/anchoring for daily belly protection and other movements to relieve pressure on the connective tissues and expand the capacities of the intercostal rib muscles, etc. Her language is very accessible, and she has a great sense of humor as well!
Plus, in the event that one still needs surgery, transverse strengthening and biomechanical movement adjustments for months beforehand and optimize the belly for surgery and vastly speed recovery - and if practiced as maintenance lifelong (without a splint and with only a once a day brief exercise session) help prevent future injuries! According to Nurse Tupler, about 90% of folks have connective tissue issues and injuries in the belly area due to past or recent injuries, chair-sitting culture, and/or developmental nourishment issues - and most can be repaired without surgery. Interestingly, her program has rave reviews by notable surgeons who’ve lived the saga of patients’ post-surgical issues and who highly recommend her program.
I’ve learned a ton from both Tupler and Bowman about nutritious movement and connective tissue healing.
Also, in general - consider a max of 2 times a week resistance/strength training to align with the body’s critical recovery processes. Ideally, in the super slow/slow burn style which optimizes metabolic response, muscle development, and recovery optimizations. As many of us know, the LCHF physician Doug McGuff MD’s book Body By Science goes into how recovery is critical for muscle gain, and health!
Give yourself some time to consider your options and the lifelong impacts - and try to take the time to make a truly informed choice that respects your body’s inherent ability to heal. From what I’ve read from you Cristian over the last year on the forum here and there, you seem like a very good candidate for natural healing of your abdominal wall based on your diligence, critical thinking skills, and self-cultivation. 
Hope this helps!
Not.
If it’s penny-sized then I’m guessing there isn’t much danger of stuff protruding through it, so totally agree with the idea that as long as you feel all right, exercise is fine.
