Having a day off from work on your birthday sucks when you are an introvert who just wants to be left alone to rest, but your friends and family have already made celebratory plans for you. Sigh... at least I found a few games on sale to add to my Steam library.
Yatsufusa
At least you have an understanding of what's going on. When I was too young to refuse birthday celebrations, people around me (and myself) had 'no real concept' of introverts and extroverts.
I hope you can find some quiet moments regardless.