It´s all about what you feel. You should always be happy with your penis, because it´s the best thing you have. The reason why you´re on this earth is to make children and so on.
But some people does´nt feel comfortable with their Penis, and it´s fully understandable. Go check this book out if you´re interested in development of your Penis.
Please help! Unknown marking on penis. 
Foreskin of penis 
Healthier Penis
Penis crooked and feels like missing flesh under skin
missing penis
