I am hoping that you have a parent that you can go to and talk to about what is happening with your body. What you are discribing is not normal. If you do not feel confortable in talking with them you have a school nurse or counseler at school that are trained to help with such problems. Please go and talk to someone you trust and seek medical advice.
so you have been bleeding for 2 months!? is it like your normal period, or just really light and spotty? also, i agree with ann071 because it really is not normal, and i think you should talk to your mom, or your doctor or school nurse about it. if you are embarassed or something, dont be, because everybody deals with problems like this, its just not always so obvious from an outside perspective. if you go to an adult that you trust for help, more than likely, they will be very understanding and your problem will soon be solved.