Don't worry about being shy. Homeopaths have heard of this and an awfull lot worse many times and are trained to be unprejudiced observers. No one will judge you . Please go to see a classical homeopath in person. There is no reason for you to feel weak from masturbation. Obviously someone told you this rumour when you were younger and and you have grown to believe it. Masturbation is a very normal occupation but is just not spoken about.