How to gain weight? Depressed because of this?

I'm 17 very skinny and I wanna gain some weight, but it all goes to my stomach and I'll really hate having a fat stomach and such skinny arms and legs. Is there any way I can gain weight evenly throughout my whole body?

I heard working out, but I've done that for about a year and I was 120 but I was still picked on because I looked anorexic...

Please help me out here...
How to gain weight? Depressed because of this?
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