I would email T ahead of time and tell her so she wouldn't be surprised. Or I would go in with the band-aid and tell her the truth. I'd probably be embarrassed and blush, but having her accept me would be worth it. My T would ask what I feel inside, and it would be a productive session about shame. I'd tell her I wanted to cancel for that reason.

A few years ago I would have panicked though! Good luck whatever you do.