Why am I getting headaches everyday?

I'm 15 years old and I have been getting headaches for about 3 or 4 months now, every single day. I eat three meals a day. I play softball and cheer. The headaches are always on the left side of my head, mainly around my forehead and my temple with little by my eyes. No medicine works, I've became pretty much immune to every pain reliever and headache medicine out there. Answers please?