are you able to go to the doc without your mom knowing why you need to go? If so make an appointment and ask your doc what it could be....also most doctors offices have a nurse on staff that you can call and ask questions.
I agree with Clysta..... No one here can diagnose, I would definitely get to a dr to get checked out bc it can be a number of things.....Good Luck
Nobody can say 100% what it is. Anything you get told here would be a guess. It could be an infection, STD/I, or even just normal discharge. It is possible it could also be pregnancy, as you're sexually active and are not using protection. I would recommend seeing a doctor to make sure nothing is wrong, and unless you're hoping to be a teenage mother you need to start using protection. Pulling out doesn't prevent pregnancy, nor does it prevent transmission of disease (and unless you've seen a doctor test proving a clean bill of health you can never assume)