I've actually considered the marines or military service, at some points in my life when I felt I had no direction and wanted something that would give me experience, something to do, and a sort of occupation. When I was a kid growing up in south america, all I wanted to do was be in the army.
But then I always come to my senses and think , how would I feel if my father, or my brother, or my mother, or someone I loved was killed or maimed by some bum ass motherfucker who joined up just because ''he had nothing else to do'' and couldnt man up and change his life without the need of the army ? Thats fucked up. (not calling you a bum, thats how I felt about myself)
War is a reality. If you join, you will have to kill people. They might be enemies, they might be civilians (look at how many civilians we kill each day in Iraq). They all, like you, have families. So unless you can look in the mirror and feel completely ready to deal with that responsibility or are convinced there is a real necessity to fight, I would say don't do it. Do a research on how many soldiers come back with traumas and get fucked by the government they bled for.
Personally, there is no way in hell I would serve in an unjust and unnecesary war.
Thats just my 2 cents. I know I might sound cheesy or preachy and the truth is I dont even know you and this is just an online forum but Im just saying, war is something you dont take lightly.
Whatever you choose to do good luck, and before doing anything look for other alternatives. Join the peacecorps for 2 years or something, whatever the goarmy commercials may tell you thats not the only way out there is