Sudden wave of loneliness out of nowhere

Once in a while, a wave of loneliness hits me through the window and I start remembering that I'm single, less social life, broke, unsuccessful attempts and still have countless goals ahead of me. Then the loneliness doubles down. I start listening to sad songs and imagining the people I used to talk to years ago. I remember those moments and wish there was someone by my side to talk to, to walk with on a lonely road. Then I post something on social media and keep checking my messages, hoping for something, but there's still nothing there. The wish remains a wish. So I try to make my mind stronger, detach from everything and go to sleep. It works for a few days. But once in a while, the wave always finds its way back again.