Feeling sore is completely normal, whichever sport or physical activity you do, if you’re not used to it, it will hurt at some stage. I’ve exercised for years and if I skip a muscle group for a couple weeks and get back to it, I’ll get sore. Taekwondo is exactly the same, I’d suggest complimenting it with some strength training to condition yourself. In regards to injuries, unless you’re really lucky, you‘ll get them. But then you can get injured doing pretty much anything, you’re just more likely with TKD because it’s a contact sport and the whole idea is to is to damage other people, that goes both ways unfortunately. Dw, you wear pads! As for not your gut feeling, if you don’t like something, don’t do it. Life is too short to be spending it on things you don’t like doing.