I have this problem since I am sexually active. I had first experience at the age of 19. I am sexually active with my girlfriends. Almost I had four girlfriends. I had sexual intimacy with all of them. I masturbate almost every day and I am continuing this for 6 to 7 years. When I do so, I used to do it fast to reach climax as early as possible. I am sexually active since seven to eight years. But not very frequent. On an average two to three times in a month. Do not have any such history of illness. But I get tensed very quickly in everyday life. Moreover suffering from performance anxiety during sex. Tried some techniques like deep breathing, squeeze method, stop and start, etc. But in vain.