i know i am being a brat but my feelings are hurt long

Back story My 2 cuisons my sister and I were really close growing up. we were all each other's bridesmaids in our weddings. I got engaged on July 4th 2020 to my better half. 2 weeks later my youngest cousin got engaged. I picked out April 23rd 2022 for my wedding date she picked out February 2022 for wedding. I am very excited she is getting married even though I do have to share some of the thunder. so here is where my feelings are hurt. She picked out her bridal party and I am not even in it she picked out her sisters best friend, my sister and a few other family members, I didn't even get a save the date card. She said it was because we are not as close as she is with the others and that's why I am not in the bridal party but its a 2 way street she can call and make an effort too. I know I am being a brat about this but my feelings are hurt that she didn't even invite me to her wedding, it's a resort in Mexico where everyone is paying there own way to attend the wedding. She is a part of my wedding party because tradition is tradition but my feelings are just hurt. It's probably amplified since I am starting my keto diet and day 1 with no caffeine and my kids are driving me nuts