How do I cope with my sister being favored?

I am having the worst time dealing with my little sisters wedding. My family is treating her much differently than when I was getting married. Everyone is so involved.. so willing to help and give her ideas, they are giving her support for everything that she's doing. For example, I asked my family to come with me three times to pick out wedding dresses and go to the fittings. No one went with me, my maid of honor was the one and only person at that boutique. My family is going with her to her bridals (When I went it was just me and the photographer, do you know how hard it is to get into a wedding dress by yourself on location?), fittings, walk through, everything. They also gave her a lot more money than they gave me, and my aunt nearly ruined my wedding by going around telling my whole family horrible things about my husband that she learned from my husbands brother ex girlfriend. (sorry that last bit was confusing.) I am so upset I pretty much am holding back tears every time I'm around them. I don't want to tell anyone because I don't want to make my sisters special day about me. I know I can't change anything, and whats done is done. I'm asking how to cope with my feelings, because I want to be there for my sister i just can't figure out why everyone is there for her and never was for me.