Painfully shy/introverted (26M) feels like there is no hope for making new relationships

I’m a 26 M, in athletic shape, I have a career in something I love & have worked long for but in spite of all the success I’ve had I feel defeated by the fact that I haven’t been able to connect on just about any level with anyone I meet.

Although I know it’s not constructive to always compare yourself to others but I can’t help but feel like a broken person because I see everyone around me with someone in their corner and mine is and has been very empty for years. Many times I’ve forced myself to try and bounce back from my last relationship but when I’m in social situations where I could meet a potential partner I shut down and lose my ability to carry a conversation, making me want to continue to isolate myself.

It hurts that this continues to happen and at this point I’ve given up because I simply do not know what to do. If anyone has any advice I’d greatly appreciate it

TL;DR: Painfully shy 26M in need of advice on how to communicate