I wish I hadn't spent my college years, plus many more after that drinking. I still am in touch with many of my college friends even though we now live far away for each other. I would have made wiser choices in college had I been sober.
Just this past week a 21 year old boy from our town died after his friends bought him 21 shots for his birthday. You never know what the effects of alcohol will be.
Find some clubs or sports, or take DrunkTx advice and party like a rock star as the designated driver.
Be proud of your choice at such a young age.