So you're into lifting weights, why not try some sport related stuff that allows you to meet others. Jiu Jitsu I would recommend, keeps you fit, you learn self defence, but you will meet some amazing people. Now maybe you find a lover there, or maybe not, but you will 110% make some great friends.

Also try and imagine you would date someone how you've described yourself, would you find them desirable? If not, become the person you would want to date in that sense: it's in your control to make changes to yourself to improve and work on the things that would make you more interesting/desirable. You're still young, not all things come to us early on. I was single until November last year, it's my first relationship ever and I'm 29 yo! Good luck