oh dear! 
it sucks! weddings can be stressful -- i have been there and done it... and also heard crazy stories as well!!!
cuz so many different people are involved and it makes your head spin...
one thing... who is PAYING FOR THE WEDDING? and also... i think you need to speak up!!! DON'T BE AFRAID!!! i have seen you speak up in here, you got the spine!!!
if these people are close to you, why don't you have a heartfelt talk with them and tell them how you feel and that it makes you sad that they are upset.... and you are miserable by keeping quiet and going along with everyone else- and it is not fair to you!
you shouldn't have to be sad because of them???
i think you need to open up and tell them that you would like to PICK OUT THINGS/PLAN THINGS OUT with THEIR SUPPORT... FOR YOUR WEDDING since it only happens once in a life time... such as that SONG THAT YOU LOVED!!?? and stuff like that?? can you do that?? hang in there girl!!! it will be over before you know it!!! then your life will be back to normal and stressfree! 