My genitals are very small, I am really ashamed and I need some solution

You should go see a doctor (family, urologist, or endocrinologist) and have your body examined to see if you have developed fully as a man and if you have the right male hormones in your blood tests. A doctor can tell if you really have an unusually small penis or if you just think you are small and if you have normal male body features or not. He can also help if something is wrong with your erections.