Im 18 years old. i can only pull foreskin back about 50% over head. i am meeting up with my significant other on saturday and i am wondering if there is anything i can do to treat this before then?

Thus is very short notice. Applications of 0/1% Betamethasone Valerate twice daily yo tight area of foreskin for ap to 3 months is best non-surgical option to correct this problem. In short-term, strongly advise using condom + lubricantas this reduces risk of paraphimosis if intercourse is anticipated. Paraphimosid is where tight foreskin gets stuck beyond head of penis & constitutes an emergency,

Do not try to pull the foreskin back as it may lead to an emergency. You can still have sex with the foreskin partly covering the head. Wear a condom. Talk to your doctor as circumcision would worth considering.