Does anybody else get this? (weight, body image, etc.)

I'm a girl, 16 years old (almost 17) and I'm 5'0 tall and 93-95 pounds. That's what I tell myself and others whenever somebody asks because I'm too scared of the truth. I'm actually 5'1 and 103 pounds. This seems so stupid but it's so horrible for me.

I have always been the smaller person who gets made fun of, the one people are dared to pick up and throw over their shoulder, I don't want to sound like a pick me but that's literally how I've always been treated. The idea of growing or gaining weight even the slightest bit terrifies me, my identity has become "the short one" or "the light one" and I fear that if that changes then I'm a nobody. It's not that I feel like I'm fat or ugly but I feel too average, I feel like I've lost who I have always been and that scares me, a lot. Is there something wrong with me if I do change?