How do I move past feeling discouraged with dating?

Hello everyone, I’m feeling a little discouraged with dating currently. I’m about to turn 22 and have in the dating game for about 5 months now. I keep hearing people telling me I’m so young and have so much time but I just feel like I’m missing something. I can’t seem to get many matches and although I’m in my last year of college, I’m not sure how to go about approaching girls. It feels different with dating apps because I know their intentions whereas you don’t know what the girl is looking for in public. I guess I feel a little down since the effort I put in when talking to girls isn’t really being given back.

I always treat the girls I see right, I’m polite, have my life together, and I’d like to imagine I’m a fairly interesting person however I’m a little bit more on quiet side maybe that has something to do with, I can definitely hold a conversation for a couple of hours though. I’m still talking to this one girl I met one month ago but I don’t like where we are at. She calls me all the time one week then the next when I try to call her she doesn’t pick up but then the next week she wants to talk again. This has been going on for months and I just want to know if things go anywhere. I just feel stuck at the moment I’m open to any advice.