Does anyone else struggle to GAIN weight?

I do. I don’t eat due to stress. I wake up and I’m not hungry for hours. If i eat most of the time i feel nauseous.. I don’t know what to do. Im underweight for my age, I’m almost 15 and 105lbs which means i lost weight.. i was 106 in July and I’ve lost a pound. It took me till i was 13 to get to 100lbs and i know i sound so dumb but it sucks because these days beauty standards are a big ass and big boobs.. i have small boobs, no ass and I’m short.. I’ve always been called skinny and ugly but its weighing on me..