Hi could someone pllease advise me what to do as i'm too embarrased to go to the parents for help

i tore my foreskin during sex, i guess cause its really tight, and now it looks liek i long wide tear. its starting to get pus in the wound, i think cause its trying to scab, btu it cant cause when my faoreskin covers my head it cant get aired... is there somethign i should do, it hurts a bit... doctors?? i dont want it to happen again
and how long and how well, will it heal if i jsut leave it alone...