How do I make things better at home again?

Okay. This is long, bare with me.

Okay, I am 17 years old, coming up for 18 in November. I live with my parents and my brother who is 14. I have applied for university and study everynight for at least an hour, plus school time. I walk six miles to and from school and go swimming 3 times a week for 30 mins to keep fit. I also have a boyfriend who I see twice a week on Tuesdays and Saturdays. This Sunday we have been together for 4 months. However I also knew him as a friend for 1 year before I started going out with him. I see my friends everyday at school and spend every wednesday with them. I would like to join a club to make new friends because sometimes my friends at school can be unreliable. However I do not have a job (Despite looking for one) therefore I cant afford it. I would like to spend my nights at home with my parents and watch a film or something, but the problem here is that they drink every night from 9pm until the point they get drunk then go to bed at 1am drunk. They place blame on my boyfriend that I dont want to spend time with them. When actually it is because they drink so much. Yes I would rather spend time with my boyfriend at night than them because all they do is sit and get drunk then complain at me. They say they dont want me to tie down to the first guy I meet and experiment (Not sexually or anything) with other guys. They seem to think that if I go out with my boyfriend when I go to uni I wont want to travel or go on holiday with friends and I’ll do everything to please him. But in actual fact (And I have told them this) im taking this relationship one day at a time. As soon as he tries to stop me living my life or becomes, possessive, overly jelous or abusive, he is dumped. But if he continues to treat me the way he is treating me now, which is with respect, care and supports all of my choices and I love him to bits. Why should I give that up for someone who treats me like bad or someone else who I dont really want just to keep them happy? But they dont listen and just argue with me all the time. I love him and I wrote that on my a social site page and my mum threw a fit and said “Thats you got your life planned out now, your going to be with Steve forever, never go on holiday with your friends, never experiment and I dont like it, your fucking 17! You dont even know what love is, and youve only been with him for 4 months what the fck are you talking about” Whereas on his side he says that he loves me over the phone when his mum is sitting next to him and she just goes awww. And says as long as he is happy then she is happy. Thats what I want at my house. I want parents that support me not try to lead my life. Help me, someone, I dont know what to do anymore. Moving in with my boyfriend is impossible because he still lives at home as well, plus im not ready for that big a step. I’ve tried to get a jobt he same place he works so I can see him a little more but no luck. I’ve spoke to my mum and dad about the drinking and thats the reason I dont like spending much time with them, but they dont listen. It seems I cant win. I dont know if im doing something wrong and my parents are in the right or wrong. Please someone help me. What should I do to make things better. I must be doing something wrong but I cant figure out what it is.