Today I think I figured out what always makes me so stressed and high-strung:
My biggest weakness and biggest strength is that I have trouble not being productive. I always turn everything into a goal and a progresson towards it, and if I don't have a goal, I have trouble just "being in the moment" and then I have to create a goal for myself. It makes me treat my hobbies like jobs, so I often have stuff that is supposed to be fun exasperating me. I thus have felt like lately I've had no time to just mellow out. I guess it's because I'm scared if I do, I'll never stop and I'll miss something important.
It's a problem to work on, but I felt like I could put it into words better than usual today.