How to choose who to invite to a birthday party?

I have 13 people who I want to invite to my birthday, and they are all my friends. I can go camping for my birthday if I eliminate 3 people. I really don't know how to do it if I don't want to offend anybody :-( there are like 2 groups and they are the sports people and my closer group of friends that is only like 3 ppl. and i really want to invite everybody!!! so ya please help me!!
How to choose who to invite to a birthday party?
Invite your close gorup of friends all 3 and invite your closer friends of sports people i know its hard because you dont want to leave someone out its hard but i got yo back homie pimp g
Reply:Just tell them you will hang out with them in the summer sometime
Reply:I have had this problem before. I would eliminatesome sports people. i know that it is hard. what you can do to make them feel better is have them over sometime and do something with all 13 like order pizza and have a sleep over. you could also go swimming, go to dinner, the movies, or even a park! you can do this before or after you go camping with the 10 girls. this way no one feels left out or upset! happy birthday! and good luck!