Feel Like an Idiot and Failure

I submitted my drug test too soon, and as a result, I may not be able to complete my school rotation this summer.
I'm so embarrassed that I don't know how to respond to admissions.
I didn't realize they wanted it done between April and May; I assumed it was only due in April...They want an explanation as to why I submitted it early.

 

Firstly, everyone makes mistakes, this might just be yours, but your mistakes do not define you as a person.

Secondly, take time to assess how you came to that mistake, and make sure it doesn't happen again.

And thirdly, wtf, which country do you live in where they make you take drug tests for school?