Hi Saphire,
If worried, use a meat thermometer. Ground meat with bacteria on is will get it mixed through the meat. Where a steak, it will only be on the outside. A good tip off is if your butcher shop smells bad, then the meat is probably to be avoided.
The red in the meat is “myoglobin”.
100% grass fed (not grass finished) beef should taste more like moose or elk. I really enjoy it. Burger Thing mixed carbs into their meat and will not disclose their ingredients in their meat. If your grass fed tastes like burger kind (YUK!!!), find another source!
If you over cook lean/wild-ish meats they come out terrible tasting.
Also be careful when consuming wild-ish meats. They are very packed with nutrients and energy. I would posit about 50% more than conventional stockyard meats. This means you will get full a lot faster and eat less of it. This also helps bring the cost down.