I can only orgasm through fast masturbation... Is it just death grip ?

Ever since I reached puberty, I would masturbate frequently. Up until about a month ago when I started becoming more sexually active with this girl. However, I could never orgasm/I would not feel as much as I would masturbating. I researched my symptoms, and I believe I have what is known in the non-medical fields as "death grip." Basically, my penis has gotten used to fast stimulation, and only that gets it off. Now, what I am hoping to get from this forum post is some reassurance. I have gone cold-turkey on masturbation. The last time I masturbate was about 10 days ago. It was during sexy time with my girlfriend, and I really wanted to finish, so I sort of half masturbated and half got a blowjob. The sensation was like nothing I ever felt; amazing! Now, 1.5 weeks later, we only had the time/room for some oral. I performed on her, she loved it, I got really aroused, she performed on me and... well, it felt good; not great. I did not finish. I am not sure if I would have finished had she kept going; we kinda ran out of time. Anyway, if we limit our sexual encounters to oral/vaginal sex, will I eventually "cure" the death grip? How long should I wait before I seek medical help? I do not believe I have anything serious. I can maintain an erection, I am sexually aroused. I drink rarely. I do not smoke.

You are doing the right thing. Only mastubate about once a week so you dont get too frustrated. Let her play with your penis as much as possible to get used to it then move to penetration