My dilemma

So my best friend is getting married in May.
I'm so excited for her, and I can't wait for the day to come.
Unfortunately, the girls all want to go to Texas for the bachelorette party.
One of the girls lives there, so we'd have a place to stay, but the airfare alone will be nearly $400.
That is nearly 2/3 of my minuscule retail paycheck.
I'm not sure I can swing that.
I would have to ask my parents for a loan, but I hate to have to do that.
It's an option, but not one I want to have to.

At first I thought I could swing it, but now I'm not so sure.
I feel bad telling the girls that I can't go, but I don't want to put myself into even more debt.
I can't afford that.
I don't want that added stress.
However, I'd have that stress of not going because I'm the maid of honor.
I don't make decisions well based off of stress.
I don't know what to do.
Ugh.
I have to make a decision asap.

Stressed out,
Bamf