Confident people take ownership of their thoughts and actions.  They don’t blame the traffic for being tardy at work – they know THEY were late.  They don’t excuse their shortcomings with excuses like “I don’t have time” or “I’m just not good enough” – they make the time and they keep on improving until they see results.  Even a tiny effort is infinitely more productive than a big, impressive excuse.  So stop seeing every obstacle as an excuse and start seeing those obstacles as forming a pathway to your goals.