How to not feel pain in loneliness?

I’ve been lonely my whole life, and just stopped socialising with people. But once a year I try and always fail every time. I feel attached to person and able to do bare minimum like to text at least once or two days or reply fast to messages. But nobody ready to do same for me. Nobody ask me what is wrong when they made me upset, nobody try to make me stay in their life. Even if I been lonely my whole life, I mean no relationships or not proper friends I feel bad. How people feel okay being alone? I mean despite many years of experiencing it I still feel bad.
How to not feel pain in loneliness?
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