I do masturbation in prone way by lying down against pillow of floor. I never had any problem with this method. However, I have read that doing masturbation  in this method puts pressure on penis and people who do that will not have good pleasure during normal sex. Is it true?
Degree understand your concerns went through your details. I suggest you not to worry. The position you are taking is safe and normal. People invent numerous methods and most common are hand masturbation and your style. This method is adopted by millions across the globe and none of them had this problem. You can enjoy sexual life for sure. There is one advantage with hand masturbation. After some time, the penis slightly bends towards right or left. This bend penis shaft gives more pleasure during sexual intercourse than straight penis. Hope this answers your query. Available for further clarifications. Good luck.