I realise this is completely a non-problem!
None of my work colleagues have remembered it's my birthday.
The standard 'thing' here on a birthday is that everyone signs a joint card, and there's a whip round, and everybody goes for lunch/has cake.
Nobody has remembered. Nobody. I've been here 6 years ffs. All the birthdays are in the company diary.
I'm not a special snowflake who wanted a massive hoopla for 'My Special Day' - just a little disappointed - AIBU??