I think celebrating birthdays is for kids
What do you have against birthdays?
I don't think having a birthday party does anything to better you as a person.
I think I understand what you mean but regardless of how hold you are it's okay to celebrate your birthday. On that same note it's also fine if you don't want to. It's your birthday and you should do what you want for it.
I decided to boycott my birthday this year.
Ok, so what do you plan on doing instead? It might help to let other people know so they don't come up with a surprise party.