How to make her feel desired?

I (26M) and my gf (25F) have been together for about a year. Sex is good but my gf is more experienced than me.

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She complains that I'm not making her "feel desired" and wants me to be more "horny" but I just don't get it. Sometimes I approach her and she just pushes me away, or calls me awkward. I just don't have that naturally sexy vibe and it's really weighing on me.

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Furthermore, our sex life is getting kinda boring and repetitive. She likes kinky things but finds choking, slapping 'vanilla' and I would like ideas on what more I can do or how do it? We have handcuffs, vibrator etc.

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I really just want to be sexier for her and make her feel desired but I just don't know how to create that atmosphere and tension. Please help