Each moment we have spent leads us to be what we are in this moment. Had we spent any moment differently, we would be different people. So never regret your decisions. They have made you what you are and it couldn't have been any other way.
Could have, would have should have... Fuck That!
If you really really want something to happen, never focus on the million ways it won't happen but focus on the one possibility that it will and act accordingly. That's faith.
Never try to define how low you can stoop. Instead verbalize and define how high you can stretch. Once you define it, it won't be long before you reach it; both ways.
Doubt is the antonym of Confidence. If you want confidence in yourself, eliminate the realistic probable things that are causing the doubt and have faith fearlessly that you will manage the other thousand things that can go wrong, if they do.