It is real, and it sounds like you have been dealing with this for some time. I would highly recommend you start a process of daily gratitude. I write down three things I am grateful for up to three times per day. The shift in my psyche has been extraordinary.
It is both. Try and focus on your positives.
Unconscious bias also applies to a host of other things during the hiring process. We tend to like people like us. Lots of forward-thinking companies will redact or scrub a host of things on a CV to not unfairly taint a prospect. This can include things such as redacting their address and their name. This is called blind resume screening. We have standardized screening questions and scoresheets, attempting to reduce unconscious bias at my company. It is still a work in progress. We will not look at a potential candidate’s social media until close to the end of the hiring process, as that could invite bias. We will look at a candidate on social media only after we have determined they are qualified for the position. After all, we want to know about red flags like value misalignment before we extend an offer. But you want to be clear that you eliminated them because of that misalignment and not because of unconscious bias in our candidate pre-screening processes.