You should speak to your parents, school nurse or doctor if you haven't started your period by about age 16. Your body may not be producing enough estrogen, and your doctor can remedy this. This discharge should look clear to white, should not be irritating, have no odor and is often in large amounts. This discharge may continue and increase in amount the first few years after you start your period. You may notice that the discharge increases and is watery in the middle of your cycle and becomes stickier in the second half of your cycle.
Many girls wear pantiliners to help maintain a clean and dry feeling.
My sister thinks it's because I am on a diet to try to lose weight. Your sister may be right. There are several reasons why a girl's period may stop, and dieting too severely is one of them. Weight loss, decreased body fat, and changes in your diet can disrupt the system in your body that regulates your period. An adequate iron supply is especially important once you've started menstruating because the blood loss every month can lead to iron deficiency.