I'm not sure you realize that loneliness isn't just solitude or the state of being alone, it's pain. Like physical pain, it's a protective response we've evolved to spur ourselves toward self-preservation. But you can't just tell someone to "just stop X that causes you pain," any more than you can tell an alcoholic to just stop drinking, or a procrastinator to just start working. I don't think you have empathy for people who are lonely.
Nobody has the power to fix your loneliness except for you. You just have to hit a point where you are so tired of being lonely that you decide for yourself that you are going to find a way to not be lonely anymore. That often means forcing yourself out of your comfort zone.
