I don't want to celebrate my birthday. Is my girlfriend right to be upset?

For personal reasons, I don't like to celebrate my own birthday. However, I am perfectly happy to celebrate other's. I told this to my girlfriend, and she initially seemed to be understanding. However, now that the day is coming closer, she first started to propose ideas, then got increasingly upset as I politely declined. It culminated with her saying she's not sure she wants to stay with someone who won't celebrate their own birthday. Does she have a point?
I don't want to celebrate my birthday. Is my girlfriend right to be upset?
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