hi, Im 23 years old with a long foreskin which covers my penis head even in hard erection but i can pull it back ( with little discomfort). when i was in my high school doctor suggested to  pull foreskin back whenever i get chance. later i read about permanent retraction and started following from last 3-4 months. now i have a problem, when i pass urine i have to put lot of pressure and i feel still little urine is remaining. what i can do next? can any one suggest me please.