I know there's alot of venting threads and stuff but I'm just really upset.

My bestest friend (Kayla) in the intire world is being the biggest b****. She said me and her and our other friends won't be friends in high school because she's becoming popular. She won't hang out with us because it ruins her 'self image'. She didn't invite me to her birthday party which is going on right now... she invited all our other friends. I feel SO left out... I just wanna cry. My parents tell me not to be friends with her because shes so awful. How can you NOT be friends with someone you've hung out with almost everyday for the past two years?? I went over to my friend's house (Michele) yesterday and we were walking her dog and happened to go by Kayla's house. Well she came out with her friends she invited over, they pet the dog and I'm like "Let's go". Michele, Amiee (another friend) and I started to leave and Kayla came up after us with her bike and goes "Are you pissed at me?" and I said yeah, shes like whatever. When she left she said "I don't understand why your so pissed at me!" Well after that she had one of her friends, Mikey, bike up and ask me why I'm mad. I said "How would you feel if your best friend didn't invite you to her birthday party??" She said "Your being overly sensitive". OVERLY SENSITIVE?!? That was IT I hate them I really HATE them. I hate most my friends, I hate school, I'm havin problems with my family and none of my friends care because they don't have divoriced parents and they've acctually got brothers and sisters that live with them. Kayla's reasoning for not inviting me is she doesn't want me to get people sick. I was sick with a sinus infection and now I'm on anti biotics and better. WHat kind of reason is that?!?!?!?!?!?!? UGHHHHHHHH

I'm really sorry this post is so long. I'm just so angry at everyone. I know people have it much harder then me right now, so I can't understand why I feel so bad.