Advice Needed

Okay so I've been friends with this girl since 9th grade....My FI and I have been dating now for 5 1/2 years...She and her FI have been dating a little over a year....My FI and I got engaged last December of 04, and she got engaged last February 05....She announces her wedding is July 06 (mine is November 06)....Now, here's the thing...I kinda feel like shes stealing my thunder!!!!! She also picked me for her MOH, but I don't really feel that close to her.... We hardly talke anymore and when my brother died last year, she really wasn't supportive, she was more into her then boyfriend, and I really needed a friend during that time...She's supposed to be my 'best friend'...Plus she is CONSTANTLY complaining that her and her FI get into fights and he is lazy and wont work and she has to support him.....So I guess my questions are:
1- Am I being immature/jealous that she is getting married before me?
2-Should I decline to be her MOH?

Sorry in advance if I am being a bit childish....Thanks for any advice!!!

I had a similar thing happen to me...I dont think she is trying to steal your thunder.

Though if you feel that you arent that close I wouldnt be her MOH. I know the person I ran into this situation with I wouldnt even be in their BP let alone their MOH.
But the situation is a little different.

My advice...forget it, your wedding is going to be YOUR day and no matter what it will always be the best day of your life...dont let it get you flustered!