Josh,

If you'd like to fly an F-18 variant then your choice is between the Navy and the Marines.  To become a pilot in either of these branches you need to be an officer, so you have a few options there..
- Become an enlisted man, work hard, and hope you get comissioned as an officer.
- Attend the Naval Academy, and upon graduating you will become an officer.
- Join the Navy's ROTC program at many universities throughout the country, and be comissioned as an officer upon graduating.

Based on what you've said about your grades and involvement in sports, it seems like you could be a good fit for the Naval Academy (more information can be found here: http://www.usna.edu/).  However, it would be best to investigate all possibilities to find which one fits you the best.

Also, as far as aircraft go, you must keep in mind that it would be 6 or 7 years before you got into your aircraft, and in that time things change.  You may change your mind on what you'd like to fly, so consider that carefully first.  But also aircraft change; if you were to join the Air Force hoping to fly the F-15, you'd be out of luck, because the F/A-22 will have replaced it by then.  Likewise, it's hard to say now, but the F-35 JSF could replace various other aircraft (F-16 and F/A-18) in various branches in 6 or 7 years.

spectreboy1221, please don't mock people based on what they want to fly (cite: he is such a sissy!).  I  know that your father flies the Apache, but that doesn't make it the greatest aircraft of all time.  Some people might want to fly much faster, maybe someone wants to fly big ass aircraft, or maybe someone wants to remotely pilot UAV's or UCAV's, but that doesn't mean they're wrong for wanting to do it.  Per your post in the "Have I sabotaged myself?" thread, the following is a quality you want in no pilots: "you must be blood thirsty wanting revenge on those damn Iraqi soldiers slaughtering our troops right now".  Pilots aren't like the people in TopGun, you have to have a cool mind and rely on your training rather than your emotions (because while it could be vengence, it could also be fear, and that just won't do).  Also, there is no advantage to flying a fighter or a helicopter or a cargo aircraft, they're just different.  In fighters, as opposed to helicopters, you do fly much faster, but you also do air-to-air combat, which is the huge draw for most everyone that wants to fly a fighter..  In a helicopter you're down low, and doing air-to-mud combat, which is a  draw to people who want to do that..