Here are the best tips I can offer if you really want to be a beer drinker:
a) Drink it in large gulps rather than sips. Sounds counter-intuitive if you don't like it, but it actually makes it much more bearable (and you look more manly drinking it that way) as you consume more beer with less of it interacting with your taste buds.
b) Drink specific beers that you find "better" than others. Even if they still suck, find a brand and start there. For me, it was a local pale ale that I found easiest to drink. Once I became accustomed to that, I moved on to other similar beers. You have to work your way up. (A lot of people find Guinness one of the better beers, though be warned - it is much more filling than most, so don't plan on drinking a lot of it.)
c) Drink wussy beer. Anything that is watery or "light" (like Bud, Molson, Coors, etc.) is easier to consume in large doses than heavier, fuller beers. So, if you're starting out, avoid the majority of European beers for now.
d) Drink a lot of it. I don't mean over-indulge, and certainly don't adopt the tendencies of an alcoholic. Just remember that beer is an acquired taste. The more you drink, the more you get used to it. At the end of the day, have a beer while you watch TV. Partake of a pitcher with friends at the bar. After awhile (and you'll be surprised by how little time it takes if you stick to it) you'll be so used to it you'll be drinking Dos Equis across from the most interesting man in the world! (Well, maybe not. But at least you can look manly instead of gagging on the bubbly.)
EDIT: Also, as I've noticed now reading the above comments, DON'T DRINK UNTIL YOU ARE OF AGE. Seriously, alcohol is not that interesting. The only real reason for it is to give you an excuse to go and hang out in pubs. Until you can do that, alcohol is not worth your time or, more importantly, your money.
I'll leave my post here for anyone else who is the legal drinking age and is interested in cresting the beer hill.