All kids are teetotalers, so basically you didn't start until you were 19. Stopping can be difficult, since you'll find it impacts what you do, especially if like most english people in your age group you do nothing in your life of note whatsoever other than getting absolutely fvck-face-fall-down drunk because there's nothing else to do in that God forsaken rainy island. It's not your fault; you're simply reacting as one must to the circumstances of living there.
That said, yes I stopped drinking. I was never a drunk. I just decided one day to take a break from it and a few weeks later decided maybe I should extend this break, and now some years later I don't ever see myself drinking again. Healthier, never hungover, it's a win. But many people will never understand this and why you do it. Or they'll assume that you stopped because you were an alcoholic.
You will probably stop going out partying with friends, though, at least to bars because the truth is going to a bar and not drinking isn't fun. Yes, because you need to drink to have fun--if you're in a bar. That's the point of them.