I can't have a vaginal orgasm...and it's affecting my relationship?

I keep trying to reassure my bf that he completely satisfies me, but he won't believe it until I have a vaginal orgasm (which I've just never been able to achieve) and it's making me sad that it's upsetting him...

Am I abnormal that I can't have one??
Update: Yes, there are such things as clitoral orgasms.
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