Stop worrying about Negative Thoughts and do not try to control them.
All you have to do is begin to think good thoughts each day. Plant as many good thoughts as you can each day.
As you begin to think good thoughts you will attract more and more good thoughts, and eventually the good thoughts will wipe out the negative thoughts altogether.
All you have to do is ask and believe, and then get yourself on the receiving frequency of goodness. You don’t actually have to do anything else. The Universe will do all the moving of things, including moving you.
When you ask and believe, you are getting yourself out of the way so the Universe can do its work.