The title sums it up really. I'm a horrible, nasty person and I can't get my head around it.
My little sister has told me indirectly that she thinks she suffering from depression and I can't feel any sympathy for her 
The background to all of this is that I am 25 with two Ds's. She is 22 and lives with our mum. She has no responsibilities apart from giving my mum some house keeping money each week (that then gets spent on her anyways through treats, shopping etc).
She moans about her awful her friends are. How selfish they are etc (which to he fair they are and I very much dislike the way they treat her) but what she can't see is that she treats me the same way they treat her. Speaks over me, is very dismissive of my feelings. If I disagree with her she gets into a massive strop.
My mum and dad pander to her. She wasn't happy living where we grew up anymore and wanted a fresh start so my mum upped sticks with her and moved countries! This was 4 years ago. At the time I was going through a hard time myself involving my ex and a court case etc. Whilst my dad as brilliant having my mum around would have helped a lot. Eventually I moved to join them.
My dad regularly sends my sister money as she is always skint. My mum pays her phone bill and buys her cigarettes and she has no other out goings so i don't know where her money goes besides shopping.
My relationship with my mum has really suffered and we are no where near as close as we used to me as while my sister can be lovely she regularly is down right rude to me in front of my mum and dad and they say nothing yet if I snap back I get a talking to.
I live 10 minutes bus ride away from my mum yet she has probably been to my house a handful of times in 3 years. It's expected that dp and I bring the children to visit her. If I don't visit then I don't see her.
I visit my dad every couple of months as I have to take ds1 to see his father. When I visit with my dp and ds2 it's brilliant but if my sister tags along I can't get a word in edge ways and by the end of the trip I feel devestated.
I can't cope like this anymore. I feel like the black sheep of the family where she is concerned. When she's not around I have a brilliant relationship with my mum and dad.
I think I feel like she's saying she's depressed for more attention which makes me feel so evil I feel physically sick.
How can I stop feeling and thinking like this? I want to support her even though I don't really believe her.