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.
Psalm 103:10 (ESV)
10 He does not deal with us according to our sins,
nor repay us according to our iniquities.
Psalm 103:13-14 (ESV)
13 As a father shows compassion to his
so the Lord shows compassion to those who fear him.
14 For he knows our frame;
he remembers that we are dust.