Notwithstanding, you should ask her out on a second date.
This is one of the best ways to know for sure how she felt about that first date and whether she likes you enough to want to go on a second date with you.
I know that you are probably anxious and nervous about all this.
Being disappointed about your first date ever is not abnormal, as there are quite a number of people who go on their first date and end up disappointed.
Figure out what caused this disappointment.
You had a lot of expectations going into this first date.
You had visualized how it was all going to go down in your head and you hoped that it would play out exactly as you had envisioned it.
Creating such a rigid picture of how you want a first date to go can be very detrimental to it.