Sounds like you need to go see your GP and possibly have a minor procedure. It won’t go away by itself, and you don’t want to leave it in case it affects sexual function or causes hygiene problems. Can you tell a parent about it? They could go with you for moral support if you’re shy. Don’t worry about it, I’m a nurse, us health professionals see penises all the time and really don’t care. Your GP will regularly inspect people’s privates and will just want to help.