L.A.
I have been in a similar situation and understand what you're going through. My mother is the problem in our family. She hates me and has spread her poisonous lies throughout our family to the extent my youngest brother doesn't speak to me anymore either. This has gone on since I was quite young and is a repeat of how my grandmother treated my mother. My best recommendation to you is to surround yourself with really good friends who love you and only want the best for you. I am blessed to have several really good friends. Those friends have seen my family (including dear ole mom) in action over the 20 + years I've known them. I've been "adopted" by a couple of their Moms and have been included in many family celebrations. While our children were growing up we spent most holidays with my husband's family and sometimes still do, though there are some issues with them as well (not nearly as severe, but his mother shows favoritism publically to other siblings & their offspring whether they're present or not). More often, though, we prefer to surround ourselves with our best friends, who have become our extended family.
Find people who share your family's interests and make friends. The void you're feeling will be filled with more healthy and fullfilling relationships and at some point you won't think about what you've walked away from except perhaps in a refelctive moment. Sadly, you can't chose who your blood family is, but you can choose who you want to be your family. It will get better!