Since the age of 12 i have had excess hair growth on parts of my body that a woman usually shouldn't have. could i have hirsutism?

It is Hormonal: Excess of hair on the body in women is called Hirsutism. The extent and degree range from normal to slight or severe excess. If you think these are getting worse, you should go see a doctor dealing with Hormone disorders(Endocrinologist) or see a gynecologist. This can be sorted out with further testing to check all your Hormone making glands in your body.