Okay well,
Every lunchtime at school we hang out in the library and there's a meter stick thing next to us. Everyday my best friend said she had a headache and if anyone talked we would get whacked with it by her. One lunchtime she decided to go with other friends so that lunchtime I had a bit more fun. The lesson after lunch she asked, "How was your lunch?" And I said "Yeah, It was more fun" So she asked "How come?" So I said "Well we had a bit more fun because no one touched the meter stick." After that was fine, but the next day at school she decided she wasn't wanted in our group and has ignored me.
Is this my fault?
Did it come out wrong?
I need help before I kill myself :(

Sooo, this girl hits people on the head with the meter stick, and one day when she didn't hang out with your group you feel you had more fun because no one was hitting anyone?

I think what you said to her is fine. It was the truth. If anything, she should be apologizing for hitting people. I understand you want her to still be your friend, and you feel that you have hurt her feelings - but you didn't do anything wrong.

Let her know you still like her (do you?), but you don't like being hit. I can't imagine why she wouldn't understand that - and there is no reason to hurt yourself over something like this! I bet the group you hang out with would agree with what you said - maybe they can also let the girl know that they still like her (do they?) and just don't like being hit... they can be your support on this... good luck my dear..