"Anyone who has never made a mistake has never tried anything new." (Albert Einstein)
I like this quote as it challenges me to keep on trying something new. Your mistakes have away of teaching you some great life lessons. So, do not let your short comings keep you down. If you fail, do not despair but rather try something new, apply your new-found knowledge from your mistake, and move forward! There are boundless opportunities that await, but it is up to you to seize the moment!