Look, we all make mistakes in life. We make mistakes with directions we decide to take with our writing careers. However, we cannot simply look at how someone else was successful over a mistake you made or a decision you chose not to take. For some reason, at that time, it was not in the cards for you. Spending time looking back on that mis-step is simply going to cause you to slow down in looking forward.
Again, I am going to one of my favorite Disney movies (OK, I get it is Pixar but hey, Disney owns everything).