Hi My quation is strange,
I am indian by birth.But I remember when I born my american doctor has given me american citizen ship.How to know whether I have american citizen ship is having or not.Is there any site to know this .Kindly help.

Doctors do not and cannot give you citizenship. If one of your parents is US citizen OR you were born in US, then you are US citizen.

If you are now over 21 years of age, it's likely that you have only Indian citizenship because India does not recognize dual citizenship.