Fast metabolism

I eat a lot! I eat every hour and I’m hungry all the time but I still can’t gain weight. I sometimes force down meals because I need weight. I’m 95 pounds at the age of 14. I hate the way I look, I can never wear bathing suits because I feel too skinny. I literally lose weight sitting down. Most people want a thigh gap but I don’t, my thighs don’t touch, and I really want my thighs to touch. I’m 5’0, I’m very long and not wide. It sucks because I can never find jeans or shorts that fit my width. Any advise on gaining weight? My goal is at least 100-110 pounds