history: My mom and sisters went shopping. My mom paid for my sisters' clothing but she didn't pay for mine. I went shopping with my mom and sisters. My mom paid for my sisters' items but she did not pay for mine. How come? Is your sister a minor and are you an adult? My sisters are all adults_comma_ I am the middle child. That doesn't sound fair at all_comma_ I wonder why she did that.
current: I paid my bill and I felt so bad.
next: If I were you, I would ask your mom why she paid for your sisters; items and not yours. That's so mean.