super self conscious

I'm 14 yrs old and am a bit over average height, I have quite a slim waist and upper body but am so self conscious of my thighs. I want to be a model but I scared of the rejection. I follow so many models on instagram which make me feel motivated but also super jealous it makes me think that they are like 25 and have the same thighs as me. I mean what will I be like? As well I look at all of my friends thighs and compare myself to most ppl I see. I don't eat that much but I don't know what to do, workout more?