I don't drink at all. I drank mostly when I was 21 to 24 and stopped when I was 25. It wasn't something I made a big deal about, I just kind of got sick of drinking. I never liked it to begin with.
It must have been peer pressure which led you to start drinking alcohol as you never liked it to being with but you ended up drinking it for about 3 to 4 years. If you never liked alcoholic drinks, this was why you were able to quit it easily.