I left
Left what? Home? School? An organization? This sentence should set up the whole statement instead, it confuses the reader as to what you are referencing.
The overall essay is confusing the read. First you got the award then you were upset? The information is being presented in reverse. The writer needs to start at the beginning, move to the middle, then end it:
What were you a member of?
What activity was most memorable?
Why was this difficult to complete?
What was the awarding criteria?
Why were you specifically chosen for the award?
Why do you feel proud of receiving this award?
Another problem with this accomplishment is that you did admit you could not have accomplished these things alone and yet, you were the only one that got the award. I believe you should rethink this accomplishment. The reviewers are looking for personal awards and achievements, not shared credit recognition.