What we think most times are the things which plays out in one's life. The things we think either boast us to try the impossible or cripple's one from doing the things that are easy but since the mind has limited that person, he or she can't do more than what goes on in the person's mind.
So in essence, I can say that our thought is the center of one's failure or success in life because what you think determines your strength and the path your life will always go.
When your mind is filled with negative things, then your life will always produce negative things but when it is occupied with positive things, the result of being positive will amaze you because you least expected such trilling results.
So my friend, it's time to fill our minds with positive things which will propel us to success and greatness in life. Stay away sounds and people who only bring negativity. Stay clear people who never see anything good and positive, rather it is only negative things that their minds reason's out of everything they meet.
Think positively all the time no matter how negative the situation around you may be.