Dear Welcome to HCM We understand your concerns I went through your details. With the given details, I can assure you, there is nothing wrong in your masturbation style, this type of masturbation cannot harm your health, mental or physical. In the mean time, I suggest you not to do excess masturbation. Be within moderation. You can masturbate thrice or four times a week. Don t be too obsessed with masturbation or porn movies. Go outside, play games, be physically active, enjoy your life and friends and relatives, love you and your life etc. If you fail to do the above and confine yourself into sexual activities, anxiety and obsession may result, leading to mental disorders. Please be careful. If you still need my assistance in this regard, please use this link. http://goo.gl/aYW2pR. Please remember to describe the whole problem with full detail. Hope this answers your query. Please feel free to post follow up queries. Available for further clarifications. Good luck. Take care.