You cannot train your attitude alone.  You need the help of quality people providing positive messaging and content into your consciousness to work on your attitude.  And you need coaching on how to do this.  It is not a sign of weakness to search out this support.  In fact, it is a sign of strength.  We do not get this support from school, any don't get it from their parents, the support of friends can be fleeting and the media and entertainment world would rather feed you negativity and distraction rather than growth, focus and hope.  So we must search our quality coaching, positive and uplifting content and train our attitude like we do our bodies.  It is how we stay focused and achieve the ultimate mental state that reflects our truest selves.  

Nurture your mind with great thoughts, for you will never go any higher than you think. Benjamin Disraeli

Weakness of attitude becomes weakness of character.  Albert Einstein

Keep your thoughts positive because your thoughts become your words. Keep your words positive because your words become your behavior. Keep your behavior positive because your behavior becomes your habits. Keep your habits positive because your habits become your values. Keep your values positive because your values become your destiny. Mahatma Gandhi