I think healthy people gain some ability to write stuff like that off as they get older, or at least ideally they do. "Just get over it" isn't good advice as a short-term fix but in the long term a man really has to if he wants to have a life that has more happy times than not.
I know some men in their 40s who are clearly still angry and bitter about things that went wrong in their life in their teens and 20s. It's not a pretty sight and IMO not a very "masculine" way to be.