Any tips how to not panic on date?

I have given up several possible good guys or dates due to fear. I feel like an imposter..they may see my outer shell of being light or laid back, but they dont know the extent anxiety has had in my life. I feel I'll be letting them down when they find out. How can I feel good on a date when I am not offering a whole person? Any tips on how not to panic on a date, thinking Im not enough? I fear Ill get so nervous I will have to leave🥺