Good day Peonyrose73, sorry to hear you are going through such a difficult time. I also have a sister, and felt that I was the “invisible” one, being she had humor and a much bigger personality than I did/do. Now as I am older, I feel much better with the situation, as I am happy with who I am, and realize my sister has her own issues, as everyone does. Personally, I would go to the wedding. I know your sister said she didn’t care if you attended, but deep down, I bet she does. Even if you went for the main portion, whilst telling yourself that you can leave whenever you want. As you can. Can I ask how old you are? Are you on your own now? I have to say that things got better for me when I moved out and found my own friends (like family). Hopefully you will experience something similar, or just being around those that build you up is important. Keep me/us posted, and I wish you peace. x