Engage in positive self-talk only.  Never speak down to yourself by saying things like, "I can't...," "I'm too dumb to...," "I could never pull that off," etc.  Instead, tell yourself you're great.  Tell yourself you're capable.  Tell yourself that you won't be stopped.  Tell yourself that the World is yours.  Tell yourself that success is here.  Thoroughly and faithfully believe in yourself.   

True friends will encourage you.  Avoid people that doubt your ability to achieve your desires.  Choose friends that have postive trajectories - people that are going somewhere - people of action - people with strong wills.  Work to bring positivity into the lives of the people around you.  Be the best version of yourself.

Positivity is a catalyst of action.  If you doubt this, picture in your mind someone depressed.  In that picture, is the person doing something active, or is the person sitting or laying there with the clear appearance of despondency?  Now, picture someone thriving.  In that picture, is the person doing something active - creating, working, thinking, etc?  Negativity fosters inaction.  Positivity promotes prosperity.  Prosperity is gained through action.

Seeking positivity is not a difficult action.  Furthermore, seeking positivity is an action that can bring the bright light of happiness into a dim existence faster than almost anything.  There is no medicine that can compare to the benefits of a positive mindset.  Words such as "psychosomatic" and "placebo effect" exist for a reason.  They represent real phenomena that testify to the power of the mind.  Bath in positivity and reap the bountiful harvest. Godspeed.