How to overcome my insecurities?

I've always been insecure, about everything about me. Mainly my size, I'm 5'5 and 118lbs, I frequently watch was I eat constantly and count my calories. I'm not over weight but I don't see myself as skinny. My mom and friends constantly roll there eyes, and yell at me when I try to express how I feel about my size. They think I'm beyond skinny, and jaw aneroxic habits because I don't see myself as skinny? Sometimes I wake up in the morning and just cry because I feel so fat, I don't know really what to do. I don't think my feelings will ever change, I go to counseling. I just always am insecure, can you suggest anything that would help me? I'm only 14. I don't want to be insecure for the rest of my life, I want to be that confident girl. :/