Questioning life and feeling lonely

I graduated not too long ago from basic training. I joined the Army Guard to help my family out a little and myself with college and all that. It was also something I’ve always wanted to do. When we completed everything at graduation, I felt no sense of accomplishment. I just thought of it as just another thing I did. Sure, I was happy I didn’t quit when it got hard, but that was more stubbornness than grit. It felt lonely too, seeing how happy everyone else was compared to how numb I felt. Then, all the other guys talked about the things they were going to do with their girlfriends and all that. One of them is even going to propose because he has a kid on the way. I’ve thought about having a family one day, but it seems hopeless with the way I’m going. All I can think about is how nobody back home is waiting for me in that sense. I thought the Army would help me figure some things out, and it definitely has, but it’s also made me feel more lonely and more confused with this whole life thing.