I've just started upper 6th and i really don't want to continue.?

I received ABD for photography, graphics and English in my first year of A levels. I've always hated school and have never really fitted in. I'm not into the whole childish manner that everyone in my school seems to have and it's always brought me down. Don't get me wrong I'm not leaving because of the people, I want to leave because I want to be in the real world, earn money and take a step into adult life. I'm already a year older then people in my year as I was held back a year but that year really seems to make a difference. I'm applying for jobs to be a photographer and I'm hoping to go far. I hope not doing my second year of a levels won't effect me in the future its just I need to get out of that place! I'm rotting there :( please help