I think it would hurt my little sister's feelings. I'm gonna be maid of honor. Not going is not an option.
That's how I felt, too, when I was the maid of honor at my sister's wedding. I was feeling super self-conscious in my dress. I felt too exposed (it wasn't an immodest dress by any means, just for personal reasons I felt uncomfortable). But, once the wedding started, my self-consciousness went out the window as I watched my sister walk down the isle and realized that 1) people probably were not focusing on me anyway, they were focusing on the bride and groom! and 2) I was so happy for my sister there wasn't a lot of room for other feelings.
I still feel self-conscious when I look at the wedding pictures that I'm in, but...yeah. I don't know how helpful that was. I know you'll look gorgeous no matter what, Pipp.