My best friend is my sister Kayla because she is confident
 helpful , and energetic.    
One reason why my sister is my best friend is because she is confident because whenever I am not sure about something,  she looks at it and they are all right. That makes me feel confident.
In addition my sister is my best friend because she is helpful. She is helpful because whenever I do somthing wrong she tells me to do it again and she helps me fix the problem.
Furthermore, My sister is my best friend because she is energetic because she can go ten hrs at the gym with out sweating. And when she chases me , she gets me because she has more energy than me.   In conclusion my sister is my best friend because she is confident, helpful and energetic.