What do you think about me being upset that my sister doesn't care that I'm home from school?
Have you asked her if she is upset that you are home?
She always laughs it off and sometimes gets upset with me because of being so helpless.
It seems like it does not phase her very much. Maybe she isn't acting that way because of you.
She just doesn't care about me. My life must be pretty miserable if I can't make my little sister happy.
You shouldn't expect her to be super happy, but I do understand that you're not happy that she's not giving you any attention at all. Maybe speak with her about your feelings?