What is with the pressure for young girls to be skinny?

Please. Why? I REALLY want to become a professional dancer, but I feel like with my weight I won't be able to achieve anything. I'm 13 5 foot 5 and 114 pounds. In the dance world I am pretty sure that is considered fat. So I'm dieting. I wish i could be 105 pounds because that's how much I should weigh if I want to be professional. Don't worry I AM NOT STARVING MYSELF! I really can't. Dang puberty, I'm hungry ALL the time. I usually just munch on some fruit or carrot sticks. I LOVE FRUIT! But I've read online that it's not good for you?! Since when!? I no longer eat white bread and am slicing ALL my portions of very healthy food in half. I hate this. I really hate this. I wish I was naturally thin like all the other dancers. Why am I so pressured to be skinny. My friend recently told me I was a bad dancer at the beginning of the summer and maybe that's why it started. Help! Why am I so pressured? Why does life have to be so hard sometimes? Please no rude answers. I am just recovering from depression.