Definitely not an expert, but could it be that it was weird because it was new? Maybe going from 0 to 60 was a lot all at once.
I don't know, I feel like the first anything is going to be weird on some level. Looking back on my first kiss, it was definitely my weirdest and worst kiss, but things change with time and experience. If you still like her and she still likes you, I don't think there's too much to worry about. (And I say that knowing that I would definitely be worrying about everything if I were in a similar situation. I know that worrying is counterproductive, but it still happens despite my best efforts.)
In other words, it kind of sounds like you're moving forward and getting into new territory, and that's exciting. Whatever happens, you're learning and progressing, so keep it up!