Is True that your life Gravitate towards your most dominant thought If you are able to control your mind, you will have full control of your destiny and life ambitions.
Many suicidal thoughts starts from silly insignificant thought and when given attention it grows to become a giant tree with deep root in your mind.
Killer thoughts are not demons in you is you loosing firm control of your thought.
Control your mind/thought with positive fresh thinking and be joyful at all times. Your mind will be free for successful ideals. Connect with the right people. Read positive literature, grow/train your mind with the right sources of good material and be full of great thoughts.