Why did it turn out like this?

When I was in my early twenties, I loved getting drunk and enjoyed the state of constant drunken chatter—it made me feel liberated. But now, at 24, something has changed. After every time I drink alcohol, I feel terribly ashamed morally and physically awful. Now I try to avoid even meeting up with friends if a ‘bar crawl’ is planned. On dates, I might have a glass of wine, but it feels like I’m forcing myself. Why has this happened? I never felt this way before