Self Esteem and the OW

I know this might sound crazy but did anyone here compare themself to the NS and it made you feel like crap. Mine is kinda weird but I was the OW....I did not realize that, I thought I was the only woman but my exN married her a woman he had been living with for about two years. I found out he was married 14 days after..but he was still wanting to see me but I ended it....I guess that makes me the OW. I know it is because she makes way more money than I do. I have a Master's degree but was laid off from my job and after a year I took an entry level job where I barely make enough money to survive. Now, instead of thinking about what a fat ass bastard my exN is, I just think about the OW being better than me and making more money than me and smartier than me and why am I not successful........this sucks!!!! Am I alone on this one....I fell like such a failure or are these issues outside of my experience with the exN????? Help!!!