I've followed an even more accelerated cycle.
Up to 15, I was a good student nerd. Then came the heavy drinking and very social years. When I went to uni I became studious and a limited drinker/socializer. Then working in a different city, mostly non-social outside of work. Now, completely indifferent and asocial.
Each time the cycle changed I shed my old friends. Nerds weren't good drinking buddies, drinking buddies weren't studious, etc.