My advice to you would be that if you have the opportunity to go to college, take it. Not everybody gets the chance to go to college after high school. I didn't. Go to college, kick ass in college, and then think about the Marine Corps. The Marine Corps will give you the knowledge and training to be an officer. If you've got brains, guts, and genuinely care about the men you command, you'll be a good officer. Like
@Teufel has told you, it's a character thing. Are you honest? Do you have integrity? Are you an honorable person?
My feeling about anybody in a leadership position is, you either got it or you don't. And if you got it, your men will follow you up shit alley any day of the week.