What are the things you don't want to hear about yourself? If you can bring yourself to open up about them here first, maybe that would make it easier for you to talk about them in 'real life' as well..
Then again, you don't really owe anyone anything.. If you don't want to talk, you shouldn't have to. Can you tell the people who care about you that you appreciate the fact that they want to help, but that you don't feel the need to talk about what's on your mind just now? And that if you ever do, you'll tell them? That for now, you can just have fun/do whatever you feel like doing..
Hugs!