Avoid Dwelling on the Past
The moment we begin dwelling on past mistakes or failures is the moment we begin experiencing the emotion of regret. Immediately we look to point the finger at someone or something else in order to justify our failures, instead of taking responsibility for our decisions and actions. As a result, we begin rationalizing and making excuses for our failed attempts.
If you begin today by focusing on the present moment rather than on the past, then this will help you throw all your excuses out the door. Yes, by all means learn from your mistakes and failures, but do not use them as a platform for your encyclopedia of excuses.