I believe in free will. I believe that as human beings we have absolute free will, hence, complete power over our lives, destiny, and everything in between. Fascinating when contemplated.
Free will also applies to thoughts and emotions.
I learned that when negative emotions and thoughts arrive to us we are to acknowledge them, converse with them, see what they are trying to teach us, and simply ask them to leave.
Thoughts and emotions respect our free will, and they will leave when asked.