"Feeling like a failure has little correlation with actually failing... Here's the essential first step: Stop engaging with the false theory that the best way to stop feeling like a failure is to succeed." - Seth Godin
Feelings can, and will, distract us from the truth. What we feel can change. What doesn't change is the truth. Start there. Know the truth--about yourself, and your situation--and believe it. The truth sets us free from how we may be feeling when we actually believe it. That's the clincher.
Spend a few minutes with: Feelings… Nothing More Than Feelings