What is the average female thigh size?

I'm 14, 5ft 3, and weigh 103 pounds. My left thigh is 19.5 inches, and my right thigh is 20 inches. First of all, is this normal for them to be different? And also are they 'fat' or 'big' for my age/height/weight? I am meant to be going to the beach on thursday with my friends, and I am really self conscience about my thighs. I tried my bikini on and the bikini bottoms make my thighs look bigger than what they really are, is there anything i can do about this?