Just like to say I went through the same feelings at exactly the same time as you (Feb of AS Year), although mine was set off by a trip through school. I went to the USA. It was amazing and I found a place that I never wanted to leave! Basically, when I got back, it was snowy and horrible and made me feel totally depressed. This then developed into resentment at being stuck where I was, I got fed up of the mundane cycle of going to Sixth Form etc and dreamed of using all my savings and just buying a ticket back out to America. Trouble was that I had been offered the chance to go back to the USA by the people we stayed with, so I knew it was possible. In fact, my parents were so scared, they hid my passport
I wasted half of my AS level year, hated every minute for 8 months. Made plans to leave, get a job somewhere, save up and then go on a massive trip etc. Then came AS results day, and I realised that I needed to buckle down! I look back now and think I was in DREAMLAND
Whatever you think now, your education is important. Like others have said. If nothing else, completing A levels means you have something to fall back on.
I did buckle down for my A level year but still missed out on my first choice uni. So I took a gap year, I've been working my butt off, saving as much of my wages as I can. And my reward? I'm going to live/work in America for a month
This way, I get to go back, I have had a year to grow up and mature and I've sorted out exactly what it is that I want out of life. In my case, I've finally decided to go to Uni in the summer, in part because it will open more doors to travelling through my career.
I didn't feel ready for everything that seemed to be mapped out for me when I was your age and its taken me two years to get comfy with it. I still have plans to travel and live abroad etc, but I think I now have a more realistic view of what I need to do to achieve this.
Try writing out a list of things you want to do/see and where you want to be (ie where you want to be living, the type of job you want, whether you want children, pets, what material goods you want, if you want to own a house etc) 5/10/20 years from now and then you'll be able to work out how to get there. In your case, you might not need to go to Uni, but there will be certain things that you do need to do, other than just go to Cali and bum out for a year! Sticking at something you don't really want to be doing now, may very well open up the doors you'll want to go through in future.