I have a just turned 6 month old tortie kitten, and she is the worst behaved pet I have ever had in my life 
She's very bitey and scratchy, horribly destructive, and seems to need company all the time or she miaows and whines.
I have had cats all my life, but I've had her since she was ten weeks old and she is the youngest I have ever had. None of my other cats have ever behaved like this and I'm finding it a bit stressful.
Is this normal for her age?