How do you deal with moving on

How do you move on from a relationship that you were in for so so long without crying all day everyday almost and everything reminding you of that person , it’s so much more difficult when I hate myself for not doing the things I should of in the relationship

And can’t let go of that guilt :( I have no social life at all anymore

And way to self conscious to go out and meet people , I feel like such a loser :(