good luck with all plans my friend.
21 is preaty great time in life! That was the time in my life when I cut gaming a lot and spend in other activities btw. just then I've meet my girlfriend - curently my wife and mather of my wounderfull daughter. First advice - if you going any type of sport... do this smart and WARM UP (that part screwed my for rest of my life so I know what im saying: ))
What I would strongly suggest - try some board games - greaet replacement + extreme social. Planty of games to choose.
I hope that small piece of advice will help you back on good truck.
Once again good luck!