First of all build up your confidence. Your penis size doesn't determine the kind of person you are. Talking about undeveloped penis if you would have given some more details we would have been able to answer it more precisely. However I am considering that you are talking about your penis size and I just want you to know that the average Indian penis size ranges between four to six and half inches when erect. However people with only three inches are also able to perform intercourse. Build up your techniques in bed rather than worrying about the size. Good foreplay and good communication will help you know the points of intense sensation in your partners body and you'll be able to satisfy her better. For any other questions please go and visit a doctor and he'll tell you if your size is really too small.