Mistakes are a part of being human. Appreciate your mistakes for what they are: precious life lessons that can only be learned the hard way. Unless it's a fatal mistake, which, at least, others can learn from.
The point, which can hardly be repeated too often, is that differentiation is not separation. The head and the feet are different, but not separate, and though man is not connected to the universe by exactly the same physical relation as branch to tree or feet to head, he is nonetheless connected - and by physical relations of fascinating complexity.
Stand up, be bold, and take the blame on your own shoulders. Do not go about throwing mud at others; for all the faults you suffer from, you are the sole and only cause.
Proclaim the glory of the Atman with the roar of a lion, and impart fearlessness unto all beings by saying, 'Arise, awake, and stop not till the goal is reached'!
Only disciplined people become free, but their discipline is not obedience to others: their discipline is obedience to their own inner voice. And they are ready to risk anything for it.