Have you ever had a regret that upsets you so much you can't get it out of ur head even for years?

I'm really upset it's hard for me to get laid and one time two years ago I had a chance with an amazing girl but came prematurely and blew the most amazing experience i could have had in my whole life. Not to mention I just got back on an awesome road trip which would have made the whole memory magical. Not to mention I probably would have been close to that amazing girl if it didn't happen because of me wanting to have it again made me nervous around her. She hates me now. Two years later the thoughts still come to my mind eveyday and I get very upset. Have you ever had this experience before? how should I let go of this guilt?