From my understanding, foreskin can cause some problems in men. I just recently learned that.
If it's something you are having difficulty with, maybe you should see a doctor.
Now, when I was much younger I had difficulty pulling my foreskin back. But I made a regular habit to pull it back for cleaning and even while urinating. Vaseline is a big help, since it can me difficult for me to pull it back when it is really dry. I regularly use vaseline. Without it, I would have difficulty too.