I am 21yr old boy. I have lack of hairs on my face & also on my chest .But hairs on my other sides are well. Sometimes I feel very bad and very embarrassed so many peoples make fun on me. Some peoples tell me that I have some serious sexual disease. Plz tell me is it true? plz suggest me?

If you have normal hair growth at other parts like under arms, around sex organ, limbs etc; you need not to worry. Many normal males may  have poor hair growth on face and chest. It may be hereditary in some cases.  Your sexual abilities have nothing to do with this. Many female likes hairy chest but not all, remember male models are exposes clean shaved chests.