I literally regret everything ive ever done. Like I cant 't even think about the me from last week without cringing in embarrasment.

You're a human. Everyone has embarrassing experiences. You learn from them. You can relate to other people by being vulnerable and sharing them. It's good. I'd just try to laugh at it. Don't take yourself too seriously. Just take what you currently do seriously. Also, there's much worse, much more embarrassing things that people have done anyway. I doubt your stuff is that bad. And anyway, you're aware that you feel regret for everything- that sounds like you realize it's not rational (unless you mean that you regret since you did shitty stuff to others?). It's really just something to work in. A problem to solve