Are you a teacher, police officer, or baby sitter?

I really need ideas of what I want to be. I'm a senior in high school and I'm most likely going for teacher but I don't know what field; Middle school (multiple subject), Spanish, or Economics (with economics I can be more than a teacher). I know Spanish perfectly so that would be the easiest, I'm thinking about the Teach Grant too, has anyone taken that? I also was thinking about joining the Marines but I want a long term so maybe a police officer which I will go to a workshop in May just in case. Babysitter seems to be my best bet but not as a professional thing obviously, I'm already CPR AED certified, have some jobs but if I want that I will find a live-in option. What should I do? Which one is better? Pays more, safer?