Don’t know what to do 😩

My bf and I have been together just over two years, he’s 21 & I am 19. He’s in the USAir Force and got stationed in England, Lakenheath not long before I met him. He was deployed not long into our relationship to Iraq for 6 months, and then came back to England. It was hard of course but we got through it, well he has recently been station to turkey for a short tour of 1 year and then from there he is going to be stationed to Italy for 2 years. When he gets to Italy we can of course be together and we plan on living together again as soon s hes there like we did when he was in England. It’s been a week and I’m honestly finding this time round to be so hard, I can’t stop thinking how long a year is going to be!! It seems so long away and I just miss him so much already and don’t know how I’ll cope with a whole year when I’m finding it hard already! I don’t know what to do or how to get through it, its so hard and all I want is to be with him. I know at the end I’ll be with him again but its just the fact a year is so long and I won’t be seeing him any time soon. We’ve done this before for 6 months & got through it but this time seems so much harder & different. Help 😩😩