Abandoned for speaking up

This is tough for me to type, but I need to let it out and maybe get some advice.

When I was younger, I was sexually abused by my grandfather. I spoke up a few years ago and started being treated quite differently. I may add that my late mother was adopted and was judged and ridiculed by our straight edge family already, so there was already a wedge between myself and them. I reported the abuse just last year and have now been completely abandoned and marked a liar. As much as I don't want to care, it hurts. I know that I've done nothing wrong. But around the holidays it gets so hard. I encourage my SO to spend time with his family because if I had a loving family I would too. I won't go with him because it just isn't the same as my old family traditions. So I sit at home alone and cry. I don't want to do this anymore, but being left behind by a rather large and successful family leaves me feeling worthless and empty. I hate being such a downer to those who care about me.