<human>: So in one of my lectures last week, a random girl sits besides me and starts to hit on me during the lecture. At the end of the lecture, after we talk during most of it she asks me out unexpectedly. 

Me not thinking it through, said yes. She seemed pretty excited at the end of it though since she wanted to hang out that night but I declined since I had work. We didn't end up exchanging numbers, just names since we both had other lectures to go to immediately. I'm not really interested in this girl and have no intentions to date her in the future and I don't even really want to go on this date with her but I was so nervous at the time she asked me out. 

She seemed like a pretty cool person in general from our conversation, just not someone I would like to date but someone I would like to be friends with.

So my question is basically this, when I see her in these upcoming days, should I tell her that I'm not really into it and don't really want to go out with her or should I just go on the date since I already said yes? 

Any advice would be appreciated, Thanks!

Condense the text into a few key points
<bot>: Girl hit on me, said yes even though I'm not interested in her, don't know if I should still go on the date or just cancel completely.