I have two sisters also and I am the middle child...Where are you as far as age goes Youngerst oldest??? MIDDLE!!!!
Don't compare yourself to your sisters!!! I have to remember this also. Both my sisters are smaller then me, and FEEL fat... I am the same weight I was when i HAD MY SON!!! (I gained 30 pounds when I was pregnant withhim!

)I will see them for Christmas and I drive myself crazy trying to pick the skinny out fits out that make me look smaller...(It's not working!) Hang in there... you look fine!