I'm stupid

I went prom dress shopping today. The store had signs posted everywhere NO RETURNS ALL SALES FINAL. I finally found the dress I LOVEEDD. I got it to go try it on. When I was in the dressing room I realized I got a size 1 instead of a a size 11. I had my boyfriend get me the right size and it was perfect. I decided to buy it. I paid $80 for it.

I get home and realize I bought THE WRONG SIZE. I bought the size 1 on accident 😓😓😓😓😓😓

Now I don't know what to do. I'm literally the dumbest person alive. I hate myself.

They're not gonna let me return the dress. And I don't have money to buy another one. 💔💔💔💔💔💔💔