With these three essential keys in place, you truly can co-create the life of your dreams. Are you ready to get to work? Because it will take work. If you’re ready to experience lasting fulfillment in a world where the odds seem to be stacked against it, you’ll need to dig deep to understand why your dreams seem to elude you. You’ll need to study how the Universe works and learn how to make it work for you. You’ll need to rethink your definition of happiness and root out the unhealthy vibrations of fear and subconscious cultural programming that may be blocking your creative energy. You’ll need to become more sensitive to the vibrations of your own thoughts, feelings, and intentions and to those of the people in your sphere. And above all, you’ll need to be committed, not just to your own happiness or success, but to the greater good of the world.

Smiling in the mirror is a proven method of improving mood of feelings of self-worth. Smiling for 60 seconds in the mirror each morning and stretching out your arms will trigger a positive neurological reaction in your head, flooding your brain with feelings of warmth and acceptance. It's not a 'be all end all' approach to self-confidence, but it should get you started.[11]
You claim that "positive thoughts always resulting in positive things" is not the basis of the LOA. In part you are correct. The foundational basis in science, as I alluded to in the article was that thought stuff particles travel through ether (not air) and interact with formless stuff to create whatever it is that you are thinking about. This was how "the law" started.

How To Manifest What I Desire