Can a girl be loose?

I’d only been with one before and that was for two years. My current boyfriend is smaller than my ex, he’s only like 4 or 5 inches and my ex was at 8 inches.
Had sex with my boyfriend and it didn’t feel great. I couldn’t even enjoy the sex and had to fake which I feel bad for. He made a comment which was apparently him being sarcastic but it was about me needing to tighten up.
Tips and opinion will be great.
Can a girl be loose?
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