Contact your local college, most, if not ALL colleges will run courses in your desired field, in which if you don't have the right entry requirements, you can get them along the way.
Say you wanted to do art at college, but you need 4 GCSEs at C or above to get in, then you can re-take your GCSEs at college, you have to go to seperate classes though, and I'd suggest maths as a definate, but it will all fit in with your timetable so don't worry about that.
Alternatively, design subjects such as art, sometimes they'll let you in with a portfolio to show you are able and have talent.. if that's what you want to do.
I was exactly the same as you when I got my GCSEs but once you've done a little research you'll see it's not so bad at all, and there's something for everyone!
Hope I've helped, let us know what you do :D
Lou xx