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Masturbation is completely normal and safe. You will not suffer any health problems in the future. The only possible adverse effect is if your masturbation habits begin to interfere with your desire for sex with your spouse.

There is no set definition of "overdoing it" when it comes to masturbation. If a person were to masturbate to the point of being sore to the touch, I suppose that could be considered overdoing it. Also, it would become a problem if it has a negative effect on other parts of your life. For instance, if someone neglected work, family or social obligations in favor of masturbation, that would definitely be a problem. Otherwise, it is a normal, safe and healthy actvity that can be enjoyed as often as you like.