No romantic partner = Loneliness. Not able to find someone. What to do
Get a job. You'll be around other people.
Go to school. You'll be around other people.
Go to a bar. You'll be around other people socially lubed.
Unless what you're "really" asking is "No romantic partner = Loneliness. Not able to find someone. What to do so I can immediately gratify myself. I have no patience, I have no desire to do anything other than sit here and feel sorry for myself. I want someone to chase me down, validate me, and constantly chase me so I feel desired and loved, and take responsibility for my insecurities and problems, and make it so I never feel anything negative ever again, and they'll do it in a way so it feels like I did it myself and have that sense of accomplishment."
Then I'd say go sell some blood and all your stuff and find a high price hooker that's great at role playing.