I'm really Skinny?!

I'm really Skinny?

I am 16 and i'm really skinny and no matter wut i eat i wont gain a pound and i know thats a good thing but i'm upset about it because i do have muscles on my arms but since i'm so skinny my arms are really small.. is there anyway that i can like bulk up? or help me get bigger?

i know how you feel my fiance was the same wy, when he was younger he tried every thing he tried gain weight stuff you get and health foods but nothing helped but he said as you get older you will gain weight.