Enlistment questions? Marines , Army, Air Force?

Im 17, and I'm Just at the Brink of making up my mind of joing the Marine Corps, My teacher looked at me like i was crazy when i told her lol But its My Life My Decision. So here it goes i go to college while enlisted is that a good idea and doesnt it add on to my service ? Also, i wanted to aleast get a good job after i get out possibly in Business or M Communications such Arts/Media, and is it hard to find jobs after you leave the Corps or is that just the marines (individuals) Fault ? Also about M Communications. Also, i've hard that the Air Force would be better For M communications and Business and i;'ve heard the Marines isnt good with that? Is That true?someone told me go Army because of The Many Jobs it has to take up a skill and i'll probly go for Rangers and I've heard to go Air Force Also, But Does The Air Force even have any combat Jobs Other Than a PJ ? Im a Aggressive person so i just dont want a desk job or do anything that doesnt get me movin round, get the blood pumpin. I wanna have that sense on Comradery and feel that sense of Loyalty and give something back to my Country for what it gave to me. May Sound Corny But its True.