What if we drive all the way there and bottle it in the car park

this is genuinely my biggest fear rn and it sounds stupid typed out but here we are. we've got our first proper meet booked. another couple, dinner at a restaurant midway between our two towns, about an hour drive each way for us. its tomorrow. tomorrow night. and i keep playing out this scenario where we get there, park up, sit in the car, and i just... cant. i open the door and my legs dont work and we drive home in silence. bf says "if we get there and you dont feel it, we dont go in, simple as". and he means it, he's really chill about it. but the issue is i feel like i'll have failed him? and ill have failed myself? bc the rational me wants this, has wanted this for months, picked this couple, picked the restaurant, picked the dress, did the diet, did the wax, did literally everything. and yet the irrational me is convinced i'll freeze at the threshold. (f29, him 31, together 4 yrs, never tried anything LS before) so my question is. has anyone actually bottled it at the door? what happened? did you regret it? did you go back? did the other couple ever speak to you again? im trying to work out if "we drove home" is a known outcome or a worst case scenario.