Is it normal i don't really interact with my family?

So I am still a teenager and most kids my age always say they hate their families and all this other stuff and really just complain about them which I Find kinda annoying but whatever I digress, I normally wake up go to school and when I come home I go straight to my room and don't really talk to anyone. I have my laptop, iPod, video games and movies up here and my studies that keep me busy. I sometimes walk up to the dollar store and buy food secretly like granola bars and juice so I can keep it in my room so I don't have to go downstairs to get food and have to talk to anyone. I don't know. Normally in the morning I get up for school and that is before anyone else is up so I can do my stuff downstairs without anyone around. And my dad doesn't get home until five and after that he gets wasted and my mom normally just watches tv in the living room all day. When I do talk to them I am pretty short. I feel as if they don't like me anyway. Oh and being the only girl and having three older brothers my mom always insisted I get my own room. All of my brothers are really close and work together and have a lot of the same friends and the hang out. My mom is just kind of there and my dad is pretty introverted like me and stays on his computer all day. My mom and brothers talk a lot about there lives and stuff but I can never do that I can't tell my mom like that I think I have anxiety problems or any other medical issues I am worried about or I can't tell her about my friends or if I am sad or even if I am happy. So is this normal behavior and are you like this too maybe? I am probably going to a university a few hours away in fall 2012 even though they want me to go somewhere closer and live at home which I don't know why considering I never talk to them and they would make me pay rent when I turn 18 anyway