Are you the "spiritual type?" Failures aside, here's a foolproof way to tell: If your spirit doesn't like the idea that you're NOT a spiritual type, you ARE one! Most likely, if you REALLY weren't a spiritual type, you'd CONTENT to think of yourself as "not spiritual." Right?
How to deal constructively with mistakes
What people do normally is they just look at whether they won or lost, succeeded or failed, and then draw conclusions from that one bit of information alone, not even looking at what were the real causes of the success or failure. When you look only at the fact that you failed, you might just conclude that you're an awful person because you couldn't succeed. But it could be of tremendous significance for you to analyze what kind of mistakes you made, and why. Even if all you can say at first is, "Well, it was sabotage," that's better than saying, "I don't know what I did wrong" (or "I'm just too stupid to do the right thing," or "God has it in for me," or "When He created me, God must have done a bad job"). Discernment helps, because it brings the light of consciousness to otherwise mysterious areas.
To learn from your mistakes, you have to understand the reasons for your failure. Then you can correct them, and succeed! If you did something wrong UNCONSCIOULY, consciousness can correct that error for the future. If you did something wrong DELIBERATELY, you don't need to feel sorry for yourself; you can just take that deliberateness, and deliberately do the right thing next time. If you failed as a result of errors that were entirely ACCIDENTAL, you can forgive yourself entirely, and skip feeling bad about it altogether.
No matter what reasons you discover, it is never appropriate to condemn yourself for them. Innocent mistakes are not your fault. Self-sabotage is a bad habit, but a bad HABIT does not make you a bad PERSON. We can CHANGE our habit patterns! Purposive wrongdoing is something we just have to take responsibility for and change, by doing it RIGHT on purpose instead of doing WRONG on purpose.
Take responsibility to have faith in yourself
Faith in yourself doesn't depend on being perfect -- it only depends on being accountable. Don't worry about making mistakes, but do LEARN from your mistakes, and be accountable to do differently in the future.
As a child of God, you have a spiritual RIGHT to have faith in yourself. You have a spiritual RESPONSIBILITY to have such faith. Your destiny, and the well-being of many other people, depends on it. GOD depends on you. Each individual has a crucial role to play.