If you're implementing the 'positive reinforcement over negative' approach into your life, it's important to trust the large body of research that demonstrates its effectiveness. Be skeptical of your own internal perception of its effects. I find that when I'm working to make positive reinforcement work, the outlier failures stand out so much larger in my mind. I struggle to understand that it's working in the long run despite my infrequent emotional reactions of anger, frustration, failure, etc.

There's some fascinating reading on the cognitive biases that are at play here in Daniel Kahneman's Thinking, Fast and Slow. https://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow