I hate how my sister acts so bossy sometimes

WHY DOES EVERYONE THINK SHERRY IS SO CUTE? IF ONLY THEY KNEW.
She kicked me off of the computer, like, literally kicked me off, cuz "she had to do homework" so I went upstairs and sneaked on the laptop, and I a few minutes later, I hear her playing piano. And before that, she was in the bathroom for and hour doing who knows what.