penis bulging during foreskin pulled back masturbation

i have a 7 inch uncut penis, when i try to masturbate with my foreskin pulled back, my glans (the pink head) bulges out, but when totally erect, it bulges like a bulb because the foreskin gets tied behind the head, and i face lot of pain while ejaculating, and my foreskin pains after calming down...

i am 22 years old and i have a wish to masturbate with my foreskin pulled back, so is circumcision my only hope ????

please help