Why is it so hard for me to reject guys I’m not into?

I am super introverted but have no good excuse for staying home and not putting myself out there. So I’ve tried a handful of first dates off a dating app, and after the first date i’m positive i’m not into the guy. but he usually wants to plan something for next time and i find it’s so hard saying there is no next time. what’s the best way to say it? i feel so awkward and mean.
Why is it so hard for me to reject guys I’m not into?
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