Long distance! army girlfriend Story.

I need others opinion of my relationship So my boyfriend who is 19 is in the army and wants me to go to Germany and I'm 17, right now. junior in high school and wanna pursue to be a preschool teacher. My boyfriend leaves at the end of march and in order for me to go to Germany we have to get married? is that rushing it and all? Then he said in the next couple years he wants to start a family he case he goes to war, which I'm terrified of! I'll be at
Home with baby and he could have mental issues. What should I do?