Sigh....Court Knee
When my friend and I were about 8, we used to watch our parents drink and have a good time. When no one was looking, we both took huge swigs out of the first bottle we could find in her mom's liquor cabinet - vodka.

OMG were we drunk - OMG did we get in trouble! It was obvious to her mom what we had done. Neither one of us could walk or talk straight.
I don't blame you for wanting to "rebel." I did that too when I was your age, though not necessarily with drinking. In a weird way, I think it's just an awkward attempt to spread your wings and take a little control in your life. There's nothing wrong with that as long as you keep a check on yourself. You're acting out because you want to have a life of your own - not end it or destroy your life.
Whatever you do, keep a healthy respect for yourself and your body - especially with alcohol. Dependence on alcohol can creep up on you. It can also cause you to place yourself in some very embarrassing and/or dangerous situations. One simple "mistake" can lead to a lifetime of regret.
Do you still want a T-Shirt? I saw a drunken woman walking down the street wearing a T-shirt that said "Take me Drunk, I'm Home"