Not sure why i cant make friends?

Ive never been able to have friends fo rsome reason. I know a lot of people say they dont have friends but in fact do but i litterally dont.

I have MAYBE one friend and hes not really all that great. He only hangs out with me sometimes. but i mainly spent the last 21 years in my room sleeping, or playing videos games. In high school i tried to make friends and thatd last about a week. And of the people i know id say hey we'd talk for a little and theyd go on about their day. I never get invited to stuff.

Im in the military now and im overseas so im really getting out of my comfort zone to meet people since i dont know anyone. 2 guys i worked with invited me out and i said yeah but then they never got me. Then they were talking about it the next day. Ive asked my roomate if he went out would it be cool if i came along and he said yeah but then proceeded to forget me. I met a guy and we played xbox a little and i asked him twice if he wanted to go out and drink or something and he declined. And lastly theres this girl i was talking to about buying a camera so i got her number and i was going to ask if she wanted to hang out sometime but she hasnt even text me back about buying the camera. Its really frustrating because i spent the past 3 weekends sitting in my dorm playing video games and i feel like a loser. Theres not much to do on base so everyone either works or goes off base.

Idk what im doing wrong. Im kinda awkward but not like creepy. Its very lonely. Any help?