No, YANBU, and I know how you feel. My birthday is the week before Christmas, so you'd think that I was used to it being ignored/overshadowed, but I couldn't be arsed doing anything because I really didn't have the oomph to chase people to come to a night out/party/meal the week before Christmas only to be told they were skint/going to a works do/seeing family. So, I told people I wasn't doing anything unless they wanted to organise it for me.
My circle of "aquaintances" did nothing, the folks at work did nothing (everyone elses "milestone birthday" being marked with a collection/present/meal or at least a card) and my sister got half a dozen people round at hers for a Sunday afternoon get together which was sprung on me and was a nice surprise, but meant I was at my own birthday party with "Sunday hair", no make-up and in children-stained clothes because I thought we were going to my sisters so that DP could look at her "poorly" computer. I did have a great time, and my really good friends were there, so I am very grateful to my sister for doing it, but over all, from the others around me (work colleagues and DP's friends who are apparently my friends too) it was utterly ignored, and yes, I am pouty about it. (perhaps I'm just not very popular really which I can't believe as I am utterly lovely!!)
Is there anyone you can drop hints too about wanting to be spoiled a bit, have a cake etc on the day?? No-ones birthday should be ignored, even if it's not a "big" one, it's still important as it's one of those rare times when we should be the centre of attention, it doesn't have to be a bed-sheet banner, or bunting in the street, but a cake and presents and a few people is not really too much to ask, surely?