Decide definitely what you want to do - are you sure about radiography? If you are, then go for your access course. Just get stuck in, don't be bothered about what other people think or are saying - it's your life it's affecting, not theirs. It takes some people longer than others to get settled, so don't be made to feel bad about changing your mind. A lot of people are still studying at your age, so you're not weird. Don't lie about going back to college, it's nothing to be ashamed about - it's better that you're working towards qualifications now than just giving up and getting some crappy job. Just go for what you want to do, make sure you're happy with your course, and work hard at it. Hopefully then you'll get where you want to be. Good luck!