Yeah it took my brother who is two inches shorter 4 years in the Military to get to 200 he went from like 165 to 208 I think. Anyway I do appreciate yours, the other guy, and Dylans two cents on the matter.
Do you record your macros bro? I'm guessing not but if you do post them here.
You are almost certainly a case of someone whose metabolism is extremely fast making it difficult to gain weight. The cure is to eat like a motherfucker but do record your macros so you have something to work from.