OK, here is how it is. Masturbation is a strange topic. It is considered taboo or sinful by many but is a common, and physically and psychologically safe way to get pleasure. You should not be ashamed at all about your interest in it. Even small children engage in masturbation.
Many people believe it is completely innocuous and it is only our society that makes it so taboo.
Others make reasoned arguments against the act. However, it will not cause calluses, insanity, unwanted hair growth or sterility. Masturbation will do nothing to harm your sex life later on, as long as you have the attitude that it is natural and healthy. It may give you more confidence in your body, because you may be more comfortable with yourself. The Catholic Church teaches that sexual behavior outside marriage, including self gratification through masturbation is wrong.