Discharge is not meant to be constant. It actually changes depending upon what stage of the menstrual cycle you are in. If you haven't had your first period then naturally it is going to be a bit all over the place. It can depend on the amount of physical activity you do and emotional stress as well. Each person is different.
Talking to parents can be difficult. The fact is that you will need to learn to communicate and put aside those uncomfortable feelings as your Mum is going to be the best source of info as far as the when your first period will be and what to expect. Your Mum is a great way to get access to liners and pads and tampons later on...