How do you self-soothe?

Sounds stupid. I have a very hard time calming myself down when I get mad or overreact to situations. I’ve always felt the need to punish myself, from 11 onwards, still struggle occasionally now at 25, I would self harm. Worked as both a release and a punishment. I have a very hard time giving myself any grace, one mistake and I’ve thrown myself down the drain, I feel its unacceptable for me to make mistakes, hurt others feelings, etc. music has always helped me but sometimes it hard to even soothe with that. So just curious what you guys do to help yourselves.