Music and learning...

Don't put off learning a new skill.  Taking on a new challenge, be it song, dance or art of any kind - it's all good for you and to be happy.  I teach lots of people who are a bit older than 12, and they love a good new set of goals to have.  Taking on a new skill means too that you're fulfilling something you've always wanted to do, and that will bring you pride and confidence.  And that's a very good thing.