I want more stuff on my birthday this year.
What is it that you want more of for this birthday? And why?
More cake and more presents, I'm old and should get more than what others get at my age.
You are not getting any younger, but neither is anyone else.  The way not to be disappointed is to never think about getting anything, that way you won't expect too much and then be let down afterwards like you feel you might be. Greediness only leads to unhappiness as a whole, do more things for others on your birthday instead.
I have to have more cake and presents on my birthday, no one else gets this much stuff on their birthdays.
Most people realize as they get older that birthday presents are mostly for kids. It's nice to enjoy the company of others and maybe a present or two. Your friends may think you're greedy and not want to celebrate with you.