Tips for A Kissing Newcomer?

So me and my guy just started kissing on our last date, and he's not new to it but that was the first time I'd ever kissed anyone. So I need some help cause I texted him and I asked him how it was and he told me I was really "stiff" which is super embarrassing! Can anyone help me fix this cause I wanna get better cause I really like him and don't want him not to want to kiss me cause I suck at it.
Tips for A Kissing Newcomer?
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