Now days you go in as 11X and they put you where they want. If you are good at PT and want to be high speed get an Airborne/Ranger contract as mentioned earlier. I went in at 25 y/o and it was very easy. I got assigned as an 11H who ended up wishing he would have been a 19D, it's plenty hands on. Good experience overall, glad I did it.
Good luck in whatever way you choose to follow the warrior's path.
Bridge