Thanks for everyone's replies. I managed to go the whole day with only one snip, though I kept touching the tips and feeling for the unevenness.
As for what this is, I don't feel like it's related to trichotillomania. On the other hand, I do also skin-pick on scabs, peel off skin from my lips, and bite my nails if I don't have a nail cutter with me when the urge comes.
I also used to self harm, but the hair cutting doesn't harm me at all physically, as opposed to all those other things. It's more of just annoying and occasionally driving me crazy from the need to keep cutting. The worst thing is maybe getting dizzy from stooping down for long periods over the trash can, and I only feel discomfort from that.
On my hair cuts - my mom cuts my hair now, and she just read a book one day and bought basic supplies. I'm not sure if she was the one who cut my hair the first time in 2012, but I've also sometimes gotten paid haircuts since then, and I remember still finding uneven strands regardless. As for going completely bald or super short, I think I would feel too exposed, as I like having hair to hide behind and protect me.
Anyway, I do think I'll be able to stop, especially since I managed to make it through the day without indulging too much. I just posted here to kind of give me more motivation to kill this habit.
A: How many friends do you have?
B: Not many.
A: That's a lot.