Off topic just need to vent and maybe some advice

I am 20 years old and turning 21 next month. I am engaged to someone also 21. We have awedding date set for this september. I know that i love her with all of my heart and want to spend the rest of my life with her and i dont even think twice about it.

Cold feet has set in with her. She went out with co workers came home a little drunk no big deal (i had work eraly next day and couldnt go out with them) Well she starts rambling about if i am ready to do this she thinks we might be too young also getting told this by others.I told her that i am sure that this is what i want and dont lestine to others. We have been engaged for year and a half and she is the one that wanted to set the date. I waited for her to want to set the date cause i could have gone the moment i got my ring and got married. Now after i have dont so much and everything is al most done palnning wise and money wise she is scared. I am a little annoyed with this but i dont want to pressure her. How do i let her know that its okay to be scared i will wait for her if she wants to postpone i am just upset becuase everything is paid for and not likely to get all the money that i have put into it back what am i going to do with the wedding dress and the favors and the thank you gifts?? I am a little confused and hurt i dont want to pressure her but now i am just scared is it me she doesnt want to be with or does she truly think we are too young?

Age could be a really big factor here. We get starry-eyed and think that things will be rosy from here on out when we find "the one." It's tough when you're younger and you are looking at a lifetime together, and then start to think "well, have I really lived yet?" Just because she's questioning the wisdom of settling down at 21 doesn't mean she doesn't love you. She just may feel that she's not ready. I got married at 19, didn't have any real relationship experience, and went through a lot of searching and such before realizing what I was trying to express.

Hang in there, work through things, maybe get some couples counseling to touch on the issues. It could bring you two even closer. 

I agree with Baileymouse.
I think it's more the age issue. Nothing to do with you personally.
At 21, we haven't been on our own long enough to really know what's what, and we want to grab life by the horns.
Maybe she's feeling like she'll be tied down and won't be able to let her hair down.
As Baileymouse said, couples therapy would be beneficial.
Good luck!!
Keep us posted.

I'm sorry to hear this.  This must be very hard for you.  I can understand your feelings.  I do agree with the other two that posted about the age thing.  I'm sure the cold feet is just because you both are young.
I started seeing my wife at 21.  She had never been with another woman.  Me, I had been with men and women.  I worried that she would feel like she was missing out.  We didn't  get married until 6 years later but were completely monogamous the entire time.  We've been together 14 years and couldn't be happier.
What I'm trying to get out with this long winded post is that...LIFE IS SHORT.  If you find someone you love, go for it.  You don't know when your number will be up.  Remind her of this.  Live the life you want now...don't wait until tomorrow.  If you break up/divorce in the future...that's the future, don't worry about that now.  You've already been planning the wedding for a while and you both know that you love each other or you wouldn't have been talking about this or planning this.
Tell her to just give it a shot...what is the worst that could happen?  I'll tell you the worst that could happen....one of you could get gravely ill or pass away and you would forever ask yourself what if....
When it comes to love, don't wait.  You may never get that second chance sweetie.

Best of luck to you and your fiancee.