So guys, I wrote here like 6 months when I started stretching and similar to be able to expose completely my glans and, after this time, i am able to do it.
The thing is still a bit strange because I have to do it veeeeery slowly and I feel my head like grasped by my foreskin, this mostly because my condition is having too much skin and the tip of it is really tight. As a consequence even when I take it behing my glansit is tight and is a bit a pain in the ass. This isn't the point in any case. The point is that while i do so I feel a strange sensation on the exposed head, something i can't describe very well, like if something is "blocked" (not literally anyway). I was eeven trying to masturbate to ease up the pain derived from the stimulation of the glans but i can't do shit with such a sensation, it worries me a lot.