Another relationship advice post (I'm sorry guys)

I'm a 23-year-old guy with an ordinary appearance. My problem is, up to now, I haven’t had a girlfrienl. To be honest, I don’t really know how to make a move, for example yesterday, I went to a concert and there was this girl who kept looking at me (I say that because every time I looked at her, she smiled and looked away). While dancing, she slowly started coming closer to me. I, in turn, slowly moved away... So just imagine how stupid I am. I've missed several chances like that. When I see couples walking in public, I kinda feel sad. Because I want to experience love and have someone to share everything as well.

Sometimes I feel super lonely. (I'm not depressed or suicidal or anything, I have my parents for everything, but that part... I don’t know, I just don’t know how to explain it.)

If you can, please share your thoughts or advice. And tell me how you met your girlfriend/boyfriend. Or say something that can help me feel better which would mean a lot to me.

Thank you.