I feel bad for rejecting a girl

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I recently met a girl through a dating app and I don't think I've ever had so many similar interests with a girl before in my life. We both like generic sci-fi movies, play/listen to similar types of music, and she's the only girl to beat the shit out of me at airhockey even though I tried my hardest.

But I just couldn't imagine myself being romantic with her. She's really tiny and her voice is pretty low.

So I messaged her after 4 dates that we should just be friends. I know there's really very little chance we'd get to stay as friends because we met through the app and she seems to have liked me too. Today, I created an OKC account and browsed through the initial list of people. I saw her profile there and immediately deactivated my account. I know this is unreasonable, but I feel really confused about her.

I think good friends are harder to come by than good dates and it really pains me to realize that if we had met in a different situation, we would've been great friends.