Guys, to reiterate and expound on cback's posting - enjoy your youth, experience things - the most boring people I met were the 'ultimately focused' individuals who had everything planned out and stuck to it, come hell or high water. Life is fluid, plans need contingencies, and, because it does happen, sometimes you choose to give up what you love for who you love - whether that choice is right or wrong in the distant future. Be who you are, surprisingly, you will change - and if you do join the military you will change a lot. You may change enough that sheeple will not understand who you are, can't understand who you are or why you do what you do.
Relish your youth, be kids/teens/stupid college students - learn - experience - fail - try again. And laugh, always remember to laugh - some of you guys are too serious - embrace your stupidity and laugh at yourselves - it proves your wisdom if you can laugh at yourself.
Everything you miss now is lost, reduce the regrets you will have by increasing the good memories to carry you through the times you need them.
One final thought - never, ever, ever compromise your Honor or Integrity, be stupid, but keep your Honor and Integrity. If you fuck up, fess up and then offer to fix it.
Now go do PT. Preferably with your girlfriend.