What a relief it's not just me... Loads of us in the same boat! We may need a bigger boat!
I refuse to have anything to do with my sister, basically tried for several years to get along but fed up with the drama that comes with her. After ten years we tried again to maintain a relationship that only lasted 10 months! Now we are back to not speaking and no contact what so ever. She has also now chosen to cut all ties with my Mum. My OH has 3 siblings and only has contact with one of them. He's washed his hands of the rest. He and I both have a close relationship with both sets of parents.
What annoys me the most is when people are "shocked'" that I have no contact with my sister. I get all the "you are related, blood is thicker than water, blah blah blah"
Life is too short to surround your self with negative, jealous, spiteful people etc. Concentrate on those you love and who love you.
It works for us.