You will fail in life. There are times when you will crash and burn. You are a sinner and even if you are a repentant believer and follower of Christ Jesus, that is no guarantee that you will not fail. You will fail, but you are not a failure. With Christ as your guide and as He walks along beside you, you will survive the times when you fail -- allow the Lord to pick you up and keep walking beside you.
Claim these Scriptures to oversome the feeling of failure:
Psalm 37:24 (ESV)
24 though he fall, he shall not be cast headlong,
for the Lord upholds his hand.
10 He does not deal with us according to our sins,
nor repay us according to our iniquities.
13 As a father shows compassion to his
children,
so the Lord shows compassion to those who fear him.
14 For he knows our frame;
he remembers that we are dust.