I'm sorry you feel so alone. I don't know how to help, but I am positive you aren't the only one to turn 22 and not kissed someone. Its not over for you!
I understand needing some affection. I haven't been hugged (other than my son) for almost a year. We all need to feel loved. We also need to start with loving ourselves. I shouldn't talk since I'm struggling with it so much, but I hope you can comfort yourself somehow, do something you enjoy?
You aren't selfish posting about you here, we all need someone to talk to. I hope you feel better soon and are able to have a good sleep