Firstly, i think you're being a bit unfair on your parents, i mean, it is their house. Ever thought that it may be you that's getting in their way?
Secondly, if you're fed up being at home, then just do general activities that don't involve being at home. Surely you're at college most of the week? Home at 3/4/5ish? So even if you are at home it doesnt mean you're there that long, and can't you just go to your room, or anywhere they dont tend to sit around? Go to a friend's house occasionaly after school, join a club, go to the library etc etc. It's not really hard to think of other things to do.
My mum and dad are both retired, which means theyre both at home, pretty much ALL the time, i never get the house free to myself for more than 2 hours or so and i see them everyday. There are times when they sometimes annoy me, but if they do, i just give me them my "leave me alone" face and go to my room or go out. You're going to be at uni next year, so at least you have that to look forward to, it's not as if you're stuck living there forever. My mum is quite interfering, but i see that as a good thing, at least she takes an interest in what i do, and she's friendly to all my friends, therefore they like her, and they're always welcome.
Also onto the other problems, when one thing is bothering me, i think of all the other things that i dislike, and it just blows everything out of proportion. Things probably aren't as bad as you imagine, you're probably really lucky but don't realise it. At Uni, alot of people come out their shell, you'll meet a whole load of different people, and you will become more confident even if you don't feel it now.
Anyway, to sum it up, basically just don't be so harsh on your parents, keep out of their way when they annoy you, it's the best way. Think about how you'll be at Uni next year and you won't have this problem. You may even miss your parents and living at home, and regret saying this about them!