Dropping out of Sixth Form

So I'm in Year 12 and I absolutely hate it. Ever since about Xmas, I have lacked so much motivation to study for my exams. I HATE my school with a passion and part of the reason for why I want to leave is to escape them. I have no interest in my subjects apart from Business. I've applied to college hopefully to start in September.
Because I'm sitting my AS exams in literally a weeks time, does it really matter if I fail them?
I feel really guilty about what I am doing because I come from a family where not necessarily I have to get top marks but to do what is considered as 'normal' i.e. A-levels and do well to go to uni.
Future wise, I would like to go off to uni but it has never been a dream of mines.
Am I doing the right thing? How do I stop caring about what others would think of me? Is leaving a good idea for my situation?
Anyone who can relate/ give advice leave comments )