I think I might be anorexic. But I just don't know. Please help!!?

Only a doctor can diagnose you. If you think you may have a problem it's best to go see someone. At your height and age that's not a dangerously low weight but it is thin. Also keep in mind you ARE GROWING so weight gain is normal. I would suggest at least talking to an adult about this, someone who you trust and see what they say. Best of luck.