I don't like to celebrate birthdays but to be honest it gives me great pleasure when I am being wished by someone. It indicates how much selfish I am. Isn't it?
Maybe something like:
I don't like to celebrate my birthday, but -- to be honest -- it pleases me when
someone remembers it. That makes me egotistical, doesn't it?
(Answer: No, it doesn't. Everyone is touched when other people remember his/her
birthday. It's only human.)