Lots of great advice above. One thing that has really helped me is mindfulness. I k ow that I can't change what has happened in the past, and dwelling on it is not helpful, neither is worrying about others perceptions. Try to focus on the present, there are lots of great videos to help with mindfulness.
I have also found getting outside and going for walks helpful, there is something about nature that can ground you.
What are some of the things you love to do?