Always told myself I wouldn’t

Ever since I was young I always told myself that I would never be with a guy who’s in the military/army etc. just because all the emotions/long distance. Im very horrible at long distance and I just couldn’t handle my loved one in there knowing they could be risking their lives. Well I’m currently with my bf, going on two years, and he just decided two months ago he wants to go into the military/marines. These past few weeks I’ve been so emotional about it because I’m Afraid I can’t handle not seeing him just the idea of 6-9 months he’d possibly be gone for or longer. I know it’s going to be more tough on him and I just can’t help but think about myself, I know that sounds selfish and I honestly don’t mean to just think about me. But like I said the idea of not ever hardly going to be with him kills me. The fact that these men not all come back home and I think that’s what makes me so nervous. Idk what I would ever do if I got a call about him or something. He does want to get married before he leaves so that way I could be with him but idk if I’ll be able to get with him. He said he has a friend in something that always gets to see his wife and idk if I will always be with him. I just need someone who can help me not be emotional about all this.