I've been self harming because of my stutter

I've been self harming because of my stutter I always feel so worthless when I stutter, I'm only 14 and already self harming because I can't say that one joke , I can't speak in class , I can't even say hello when someone calls me and I just have to stand there and hear them talking when all that can come out of my mouth are disgusting sounds. I just wish I had a normal life and could socialize like other people my age. ​