What is the normal weight for a girl teen? and did I do a good job of losing weight?

I'm a 15 year old teenager. I lost 6 pounds this week. :) Went from 135 (with a fat stomach...) to 129 (with thinner stomach). Did I do a bad job? Should I loose more? I'm pretty fit, I just have a little extra fat on the thighs and stomach. How much should I weigh?