What does it mean when NOBODY remembers my birthday?

I've grown up in the same crowd of people since I was 5 years old, and since then, I've shared a birthday week with three of my friends. For the past couple of years though, I've been struggling to be noticed, and last year nobody seemed to remember my birthday! know it's not all about me and I probably sound like a stuck up snot ball by even asking this, but should I be worried that nobody even noticed or recognized that it was my birthday? My birthday has come around again, and I'm bracing myself for another forgotten year. Are my feelings of sadness justified?
What does it mean when NOBODY remembers my birthday?
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