I'm sorry this happened. I understand disappointment but I would say that it's probably kind of overthinking it if you had "big plans" or even anything beyond finding out if she was worth dating on a first date. Try to be realistic, I'm not saying that to be harsh, I mean, not judging, I can see myself doing this too but I also know that if I keep my head about things, I would be more objective about the first date itself and try to keep in mind there isn't anything there to plan anything for the future but possibly a second date...

don't give up. out of dating, I'm sure there could be a number of single dates before you find the one that you hit it of with. Not many are lucky enough to have it go great so quickly anyway.