Probably because you're getting tired of it . Same thing happened to me . I play music for a living & was partying a lot . Im always around liquor & "things" when playing concerts or clubs & just got bored with it . You're realizing that there's more to life than partying . I say , good for you !
Maybe you are too shy to show you to everybody.Try to get more and more easy-going!!Also you shouldn't be strict with others~When you see the world harmoniously?and the world will also be BETTER to you!
Maybe it's your body's way of telling you not to pollute it. Maybe your sub-conciounce is sick of waking up hungover & unproductive the next day. Maybe your conscience prohibits some of the fun because you know that come closing time you risk not only a DUI, but many lives by driving home drunk. Maybe common sence tells you that blowing your paycheck at the bar on overpriced watered down drinks is dumb. Maybe boredom hits you after pool & darts when you have to listen to the same old drunken stories. Maybe your self respect is tired of waking up the next day feeling like an ass for whatever you did the night before. Maybe your morals tell you that you'd like to meet some one worthy instead of a bunch of bar flies. Most likely you have reached a level of maturity that unfortunately many never do.