I moved out as soon as I turned 18 and it was difficult. I did it, but it was difficult. And I had some really really great support from some friends...friends who were on the right path in life if you know what i mean...(not partying friends). I could not stay at home one more second.
It sounds like you are making good plans. If I were you, I would wait out those 6 months at home IF IT IS POSSIBLE, making even more plans, getting ready, saving money. And you need to graduate high school. Also, you need a plan B in case the ROTC thing doesn't pan out. Make plans, and back-up plans. Ask those friends and their parents if you can stay there in an emergency (like if mom and dad kick you out one night or something) or if you can stay with them for a few months when you turn 18. Tell them how long you would need to stay and what your plans are. (Not, "Hey man, can I crash at your pad for a while?" lol!)
You have a lot to do. If you move out now, you will have even more stress. You can handle it, if you need to. The question is, do you need to?
Keep posting here!
and GOOD LUCK! And Merry Christmas!
-LisaBOBeesa