Please don't self harm

I tried self harm yesterday because I was feeling so shitty and dumb over the past few months and all it did was make me feel worse and now my arm looks like shit because I cut and scratched it with a kitchen knife. The only thing it did was make me feel worse and now I have fucking cut and scratch marks all over my arm. Like I said please don't self harm because all it does is make you feel shittier and doesn't help at all.