It's my birthday and I think I should be able to make my own plans.
What reasoning do you have for wanting to plan it yourself?
I hate surprises
If that's the case, then go for it!  There's nothing wrong with wanting to pick your own birthday plans, regardless of your reasons.  I hope you have a good birthday!
GR8 thx I am so excited
Surprises can be daunting and I completely understand wanting to plan your birthday on your own. I'm sure you and the people you invite will have a wonderful time!