one of the most memorable birthdays i have had is a surprise birthday for my 18th or 21st and i absolutely hated it. i appreciated the effort my family went through to do it but it was my literal nightmare.
my birthday tradition is to spend it doing whatever i want and not feel bad about it. if that means spending an obscene amount of money on shoes i've been lusting after, heck yeah i'll do it. if that means spending the entire day at the cinemas, you bet i'm there. if that means going out with my friends or travelling, yeah i'm doing it. and sometimes i actually just don't feel like doing anything at all and that is sometimes a vibe too.
i think sometimes we are put under pressure to celebrate our birthdays in a certain way with others or throw parties but if that isn't authentic to you or you just don't feel like it, your birthday should be the one day of the year that you can do whatever you want.