Is it normal that my dad won't let me drink in my room?

Since you're under his roof, follow his rules.

Why do you want to drink alone?

Cuz he doesn't want you to be a drink who sits at home and drinks alone

Your dad wants to drink a beer with you. Do it!

This really isn't much of a chore is it? Your father hasn't said "don't drink", he has simply said "if you want to have a drink, do it in a social setting (I.e. With him watching tv) and not alone in your room like some sad lonely alcoholic".

It's his house you are living in, and while I would be the first to condemn a percent who is repressing or exploiting their child because they are living under their roof, this clearly isn't the case here. House rules, don't drink alcohol in your bedroom.

Tell your dad to go fuck himself and punch him in the kidneys

I know its annoying but it is a sign of future alcoholism :/ he cares about you n probably wants to hang out

You're old enough to drink, you're old enough to move out. Parents don't just say or do things to be assholes, they're trying to put you on the right path. I found I got on ten times better with my folks once I moved out and then you finally understand why they say/do what they do.

are u old enough to legally drink?

There's a myth that alcoholism is a solo activity. Whether your father is right or wrong in believing that myth, it sounds like he cares enough and worries enough to try and protect you. Although it may annoy you, it's no bad thing.