If your foreskin is even a tad tight, even if you can retract it, the law complies you to get circumcised immediatly. Go to the nearest emergency ward of a hospital. Tell them someone you don't know on the internet told you you had to get cut immediatly
;-)
Seriously, if you can retract the foreksin, then you can fairly easily losen it up without need for surgery. Just make sure that iof you retract whil hard, that you immediatly try to bring it back over the head. If you are unable to bring it back over the head while hard, think margaret thatcher naked on a cold day and lose your erection ASAP. If you remain with a tight skin that cannot come back over head, it is called paraphimosis, and this (seriously) does require a visit to emergency ward ASAP. The longer ths condition lasts, the more the skin will strangulate blood flow to the glans, and the bigger the glans gets thus making foreksin even tighter.
Now, assuming you can bring your foreskin back and forth, then doing this as often as you can (in a gentle fashion at first) will loosen your foreksin. Whenever you piss, retract foreksin fully and bring it back over head once done. Same when in shower. And you can also do some stretching exercises to loose it up.
If some properly, some simple "play" with your foreskin will loosen it up without the need for surgery.