I Need Help Please Comment

So I guess I have a really fast metabolism so I can eat so much an never gain any weight. The doctors i go to keep asking me if I'm starving myself any everyone around me keeps telling me I lost weight. I don't know why I started losing weight but now I'm hitting the 90's (I'm 16 btw) I am aware that I'm very thin an I really want to gain more an fast. Do anyone know what things I can eat to gain ALOT of weight an fast ?
Ps. It's not genetics everyone in my family have a lot of fat on them I'm the only one that doesn't 

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