So guys, I thank all of you now and hope that someone will be able to help me.
I'm doing stretching to pull back by foresking from months and it is working, and from a bit of time (more or less 1 month) i'm able, if I want to pull it back almost completely.
Sometimes the foreskin remain very loose and don't return to its normal status for a lot, meaning that it easily roll back, even when my penis is soft.
Now, i have streched it back yesterday, trying to masturbate with it pulled back, one of the thing i wanted to do (to be able to use a condom without pain) and it hurted too much andi gave up. But, even this morning the foresking is still soft and roll back like nothing.
It should be a positive thing? It haunts me a bit.
P.S. The point is that if i try to masturbate normally my foreskin goes fast behind the glans and it comes out. It has NEVER acted this way.