“ Complaining does not work as a strategy. We all have finite time and energy. Any time we spend whining is unlikely to help us achieve our goals. And it won't make us happier. ”
Source: The Last Lecture
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Don't waste your time with explanations: people only hear what they want to hear. 
Attitude is a choice. Happiness is a choice. Optimism is a choice. Kindness is a choice. Giving is a choice. Respect is a choice. Whatever choice you make makes you. Choose wisely. 
Always acknowledge a fault. This will throw those in authority off their guard and give you an opportunity to commit more. 
If you can keep your head when all about you are losing theirs and blaming it on you, If you can trust yourself when all men doubt you, but make allowance for their doubting too;! 
No life is a waste... The only time we waste is the time we spend thinking we're alone. 
Be grateful for what you already have while you pursue your goals. If you aren't grateful for what you already have, what makes you think you would be happy with more.