Feeling guilty about masturbating...?

Absolutely not. There are no side-effects, negative ones at least, as a result of masturbation. In fact, it has been shown to lower stress and lower blood pressure. And no, it will not deprive you of any sexual pleasure during intercourse. So relax and enjoy your body. And keep in mind that there are certain agendas that want to guilt you into giving it up. Usually a religious agenda.