I'm going to cancel a tinder date to go see another girl.
Why do you want to see another girl instead of your original date?
I want a girl who is more active and interesting.
It's reasonable to not date someone that you aren't interested in. If you agreed to go on a date with the girl that you aren't interested in, it would be wasting both her time and your time.
I have the right to do whatever the hell I want.
Only date the one's you're interested in to begin with.