Im 14 years old. Im healthy and I'm very athletic. But recently I've had alot of headaches. A bruise showed up and I have hit anything at all. I sometimes get dizzy, and I'm also more tired than I have ever been. But its off season for all of my sports. Please tell me whats wrong. Im scared to tell a doctor or my parents because I dont want them to think Im lying.

Please and thank you,
Mary