A lot of people are introverted today. Many folks prefer staying in, watching Netflix, etc. That's not going to stop you from finding a guy, in fact it helps you.
My advice would be to expand your social circle a bit, beyond military guys, and just relax. You're young, you don't need to rush things. Have fun. Meet people. Go out on a date if someone decent asks you out. Let things just...flow.
Don't overthink. I know it's easy for me to say that online but for real. I'm similar. I overthink a lot of simple stuff. But I found that putting myself in social situations forced me to take some risks, deal with random circumstances, and meet people.