sometimes i hate myself

We always have something we regret doing, it could be a words said, an action done, or a bad decision. However, if we keep on stressing the wrongs things we've done, we're only cultivating ourselves to be more insecure and to have a lower self-esteem. I'd suggest you get over what you're regretting because there's no way you could undo what has been done, instead learn from it and it'll be great if you don't commit the same mistakes. Give yourself a break by not reminding yourself of the wrongs you've done. Good luck!