I feel that my penis might not be as sensitive as before, and I have the suspicion that my masturbation technique might be the cause of it, because it's… different, as there's no stroking motion.
I have excess skin around my penis especially on its underside, even though I'm circumcised, and I usually just keep tugging on it and that eventually brings me to cum. I often just pull it and sandwich it between my stomach and the waistband of my shorts and keep wiggling back and forth and I can do it hands-free.
Another way I do it is by enveloping the head with the excess skin from underneath it and rub the head through the skin, so no direct contact with the head and none of the usual masturbation stroking motion.
I know it might be hard to visualise especially the first one, but could this be why? I went to a happy ending massage that only offered handjobs the other day after a very long time of doing it solo, and I lasted a very long time not because my stamina is that good, but because I legitimately didn't feel that my penis was stimulated that much. The lady also played with my nipples and I felt more stimulation on my nipples compared to on my penis. I eventually only came because I closed my thighs and clenched repeatedly, it gives a similar feeling to when I do the hands-free version as there was pressure on my prostate. This worries me as it might make actual sex not satisfying for me in the future.
Can I retrain myself to be able to enjoy direct contact and feel more stimulation on my penis? If yes, do I do it by only masturbating with the normal stroking motion, or maybe just hold off on masturbating for a while? And how long until I can get there?
Thanks in advance for the help.