What Are The Episodes Of Short And Constant Headaches?

Hi, I'm a 15 year old male and I have this weird headache problem. My head just feels unusually vulnerable to short, constant, non-intense headaches. Also one of these almost always occurs when I like down (the flatter the more intense), when I'm upside dow, or when I have to shout or sing loudly. I have had this problem pretty much for as long as I can remember, so if there's anything I can do about it please tell me. Thanks!