Turning 14 an wanting to fly a plane really bad but there's a problem?

ok out of the bunch of the family,i want to be a pilot. yes i do. i wouldnt mind what i would have to fly, a glider, balloon, helicopter, or a plane. but all i know is its not cheap. i am not a very rich person, about an average U.S. pay ( for my parents). But i think i wouold like to fly a glider. i want to fly for fun and then go into something serious, im in the durham NC area and am looking to call up Blue Sky Adventure at RDU. and check it out if i can get my dad to get me going, also i was wondering how old do you have to be to fly military jets. im going into the ROTC in high school and was looking foward to fly there, but now i am thinking i would like to start a little bit earlier. any suggestions and answers to my questions?