Your 20's are your selfish years. Some are lucky enough to find themselves and figure out what they want, most aren't though.
Selfish does NOT mean go around partying,blacking out,being promiscuous,hoeing around, or not holding yourself accountable for your responsibilities and actions.
Figure out what you want to do. Career wise. Figure out if you want to love or just be single. Go out on dates.
I'd say tha hardest for me was 21-24. I'm 26 now and still working on myself. I'm happy though, i can say that much,
Good luck on this journey we call life