i’m about to expose myself but Banri Settsu from “A3!” /hj (yes it’s originally a game but we got an anime series now)
jokes aside, and going into more popular anime, i’d say maybe Near from Death Note?
EDIT: I CAN’T BELIEVE I FORGOT KOTOMI FROM CLANNAD I RELATED TO HER SO MUCH
I can’t think of any anime character who’s similar to me, but I do find Kurapika from Hunter X Hunter relatable sometimes. We both try to act calm, but our rage always gets the best of us when provoked.
Rei Kiriyama from March Comes in Like a Lion is a relatable character for me. Also Kaguya Shinomiya from Kaguya-sama: Love is War (except I’m not rich like her).