There needs to be a build up, so start up slow and work your way up. Usually focus on stimulating the clit but if that doesn't do it for you you can try vaginal masturbation and or both at the same time. Also try buying sex toys they gonna help a lot reply
My best advice is to learn vaginal anatomy and try to experiment. I had the exact same problem when I first started out, and i soon realized that it was because I’ve only ever done penetrative masturbation, which actually only works for a small percentage of women. I discovered clitoral stimulation and have never gone back to penetration.
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