Why is my arm weird? Like my ulna I think is very visible and it is very awkward?

Its like more to the side and very weird. Is it because Im skinny? Im 161 cm, 42KG & 13 years old. If so how do I gain weight ? Cause I eat like alo

It's like more to the side and very weird. Is it because I'm skinny? I'm 161 cm, 42KG & 13 years old. If so how do I gain weight ? Cause I eat like alot . I eat the same amount of food my parents eat and their overweight. Or is it because I exercise alot ? Please answer ASAP.

or:It's like more to the side and very weird. Is it because I'm skinny? I'm 161 cm, 42KG & 13 years old. If so how do I gain weight ? Cause I eat like alot . I eat the same amount of food my parents eat and their overweight. Or is it because I exercise alot ? Please answer ASAP.

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