Am I overweight for my age?

I am 5'6", I'm a 14 yo female and I weigh about 90 - 110 Kg. It varies. I don't go over 110 and I don't go under 90. I am at times unhappy with my weight, but at the same time, it makes me feel different than all the other girls obsessed with weight, which is a lot here in Canberra. Please don't tell me "Get on the walker" or "Go for a walk" because I can never get myself motivated. I have tried, but I never get into it. I am a vegetarian too (I eat fish though)... So, am I a little over weight, am I OVER weight or am I average?