Alcohol, like most things, is fine in moderation.
Drink to catch a buzz, not to get obliterated and you'll be fine. There are going to be times when you drink too much and suffer from terrible hangovers, but they should be the exception and not the rule. If you are blacking out every time you drink, you're doing it wrong.
To everyone who really doesn't understand why people drink~
Instead of blindly judging people's motives/character, maybe you should try something frilly like a margarita, or a daiquiri, or anything which tastes alright to you...just stop at two.
Or don't. No one fucking cares. Just try to be less condescending while you're talking out of your ass about it.