How do I move on with life?

I experience these waves of regret in my life and I can’t get over it. I feel like I’ve wasted so many years that I can’t get back 🫤. It could be something as little as regretting my university choice (even though I’ve already graduated 🤣) Also, I’ve met some evil people that have made me carry an anger around and I don’t know how to deal with it.. I just want to move on and be okay with the fact I can’t get those years back. It makes me physically sick..