I think you and me both can agree on the fact that "tell me about yourself" is the worst thing a person can possibly hear nowadays. Anything I write here will sound cheesy.
Imagine yourself trying to get to know a random person on the street. I'd like you to think of me that way.
If you think that's not much to go about, then just relax and think again. Or, rather, stop thinking and write some utter randomness. Talking is not a job and it's certainly not something you should be nervous about. Go easy.
I'm really not that bad. Really.