((((Belial))))

What has already been said is great advice!

You failed at one thing, that does not make you a failure!! What you need to do now is pull yourself together and charge forward. Do what you need to do to learn more in your field and be confident that you can do it!! I think almost everyone has had something like this happen. Use it as a stepping stone to become the best you can be! Don't be a quitter and don't sit around being sad/mad.... "Today is the first day of the rest of your life". Make the most of it. You only go this way once!!