Yeah, I do. I relapsed in December '19. I don't do it very often now, because my boyfriend would DEFINITELY notice and god, I don't want that. Usually it's cutting, but I do a lot of picking, too. For a really small period I smoked cigarettes purely for harm purposes, but decided it wasn't for me. There's a reason my roommates watch for a specific brand of vodka in my room, too. I do a lot of self-harmy behaviours but I really, really don't recommend it to anyone who hasn't started. Don't get the ball rolling, if you can help it. I can't speak on whether it's worth it or not, since I've been doing it forever, unfortunately.
I have to admit, it does help me cope when I'm suicidal. I think that's why it's so hard for me to quit, beyond the general addiction.