My best friend is oh-so-unsubtley trying to organise a surprise birthday party for me, via DH. I'm hitting an 0 birthday next month. I'm completely not fazed by it, but I don't want to make a big thing of it, either. I may do tea and cakes at my house on afternoon, but that's it.
And I keep being asked what I want for a gift - I can't demand things, it's alien to me.
My DSil's birthday was a couple of weeks ago: pre-dinner drinks, dinner, live band, simple enough but things got blown out of proportion by other DSil, we were asked to pay for birthday person's dinner (fine by me), plus donate money for another gift to 'remember the night' wtf? I'd already bought a present - everyone had - and I resented gaving to fork out for another, so put my foot down - as did everyone after I opened the flood gates!
It spread a lot of unnecessary bad feeling and faff and by the time the evening rolled in, we werd al, pretty sick of it (unbeknownst to DSil). I'd hate that to happen behind the scenes of my birthday. I think about doing something 'big' and just get really anxious and FUCK OFF about he whole thing.
If we had the money, we'd go away for the weekend somewhere.
I'm rambling 
I get how you feel, not quite. If people ask, just breezily say, 'oh, haven't decided yet', and leave it at that.
If anyone tells me I'm feeling anxioys because I'm going to ve another 0, I may give them a Glasgow kiss 
Here are
for us to throw at people