How do I explain to my partner that I don't celebrate birthdays

Long story short we've been dating for 5 years and each year she tries to have me celebrate my birthday. Each year I tell her I don't and to please stop. This year she's hoping to throw a suprise party but it was leaked to me. I want to have a conversation and tell her I feel like it's disrespectful to continuously have me celebrate a day I extremely dislike but I want to know how to go about it.