I had the same problem last night. You can see my post about "i hate condoms.help." Im not very experianced and I was terrified last night that it was some huge mental barrier I had but reading other peoples experiances it sounds like I shouldnt be worried!
Im going to put my experiance, like yours, behind me and just forget about it. Why think about it? Hopefully itll just be nerves and when I see her tonight there will be no problem. Hope you find the same.