Stressed and Worried (LONG STORY)

Lacoda
I'm 18, about to turn 19 the day after Christmas. My boyfriend is 18 as well. He just turned 18 in September but is mature for his age and has a really good head on his shoulders. I've been enlisted into the military since the 8th of June. I leave for basic training Feburary 2nd of 2016 and it will last 2 months in Chicago, IL and then fly from their to Virginia for my rate/military job training which will be another 2 months. So I will be gone from home and family/friends/boyfriend for 4 months.  My dilema is this: I cry a lot because I'm worried about leaving.  I sadly work at McDonald's and close the store which is around 11-12 depending if it's days or weekends and that's all I do in a normal day and he has college and then work for a few hours shortly after he gets out of school. By the time I get home and want to talk to him, he's too tired to really be fully there in the conversation or he is but I don't know how to deal with it all because we were each other's firsts and he's my rock. Literally this guy is my very closest best friend. I tell him more than my diary and I'm just so scared to leave because I love him more than life itself and my parents want him to be "the one" and he keeps talking about marrige and I know he will save up and get up the courage soon enough but we care so intensly for each other. But it's just so hard because I see him every single day and I've only been away from home (the longest) for a week at a time and I wanted to come home 3 days after my leaving and me leaving and starting my life and knowing we won't be together for a good amount of time is really taking a toll on my emotions. After I come back from basic and a-school, it will be the begining of June and he won't graduate until Janurary of 2017 so you can figure out how long I'll be by myself and stationed in a place I've never been and is foreign to me, until he gets done. I cry a lot and so does he because we're so sad about it but Navy is my dream and it's all I want for myself as far as a job goes and he is incrediably supportive of me and wants me to live my dreams and says that as soon as he's done with college, he's coming for me so we can be together like we've wanted for so long. We have talked about having a family but not for a substantial amount of time but we envision all these wonderful future events together and it's hard because when I'm gone, I'll miss Valentine's Day and our 1 year and I know that makes me sound like sonebody who is just starting out in their relationship but both our parents say we were meant for each other and honestly we're so attatched to each other. Like best friends and lovers should be. But I just don't know how to deal with it because I'm upset a lot and the fact that my uterous wants to slip on out right now (my period).... Well it doesn't exactly help. I just need a little more support and it is strange to ask random strangers for a support system but the way everybody has each other's backs on here makes me feel a little more secure. Comment anything you might think could help me through my troubles. I know it will be okay but I'm just having a hard time really getting to the point of accepting that it will be okay if that makes sense. Thanks a bunch.