Your 20s are the decade of mistakes. You will regret a lot of things you do during that period of your life, but it's fine—as long as you learn from your mistakes. AskMen is helping you maneuver through this decade of missteps, acting as a spirit guide with 10 things you shouldn't do in your 20s.
For example, don't undervalue the importance of exercise, because one day and about 40 pounds later, you'll be wondering where it all went wrong. Don't avoid the dentist or doctor like they're the plague, and if you're still going to try and shotgun beers, know that there's a time and place for that.
Take heed of this advice. All of it.