I am addicted to Masturbation. What can I do?

I meditate daily for 5- 10 minutes with Breathing meditation. So, far I have curbed my Porn addiction. But, finding it difficult to keep away from masturbation. I keep telling myself, that I am wasting my time, water and every potential. But still I find it hard to keep away from the compulsion. It may be because I read in a medical book, that masturbation was normal. But, every time after doing the deed; I'd feel guilty and depleted of energy. The compulsion is strongest whenever I go to have a wash. If it arises when I am alone, I can keep myself away - through by strenuous exercise or playing rock music on my piano. But, I re-lapse every time I go on to take my wash. Now, it's hardly like I could keep from washing myself. What is the best medicine that the greatest way would recommend me to do?