Im a 19 yr old man and 5'3". i really want to increase.my height. moreover i look like a 15 yr old. please help.

See below: This is likely due to you genetics, but if you are having any delay, a physician can help determine if it is amenable to treatment.

May be too late but: I'm sorry to tell you that most men stop growing around age 18- but occasionally some will grow until age 21 or so. Taking measures to increase your production of growth hormone might help, but if your growth plates have closed (like most 18 yo's) then you've reached your max. But some men do grow a few more inches after 19- see http://bit.Ly/1jcn4cp for natural ways to raise your hormone levels.