I support your efforts to live in real time with real people and to have relationships with real people! Sadly, your coworker does not share the same feelings you have for them but, still, seeking the friendship of a real person is a positive step.

I think you should discuss your imaginary friends with your new T, as well as your feelings for your co-worker. I hope you will continue to reach out to other real people for friendship. I wish you all the best.