I have a tight foreskin which retracts past the head of my penis when flaccid but dosent pass the head when erect. it dosent cause any issues or pain. what should i do or what do i have?

Please see a doctor to have it treated. Do not force foreskin over the head. Visit this site for information on phimosis: https://urology.ucsf.edu/patient-care/children/phimosis#:~:text=Phimosis%20is%20defined%20as%20the,two%20forms%3A%20physiologic%20and%20pathologic.

You have a tight foreskin. Retract your foreskin as far back as possible using cortisone cream as lubricant several time daily and make sure to pull it up front when done- for a few weeks It will make it more supple and retractable. The other choice is a circumcision