I have been on the other side of this.
When I evented my pony we won A LOT. Or at least placed really well. People always thought he was push button and I just sat there. In reality he was super spooky, afraid of people, would run away, would stop at jumps if you didnt ride pretty perfectly. That pony taught me a ton. People would always talk behind my back or make comments that I only won because of him. Then they would want to jump him and he wouldnt even go over a cross rail...
After training a lot of horses for a few years, I got my mare. She was a steal, and she's pretty fancy. I still get the same thing about how I have it easy and my horse is just really good, I don't have to ride hard. She IS really good, out of 3 events this summer she got a 2nd and a 1st. I am VERY proud of that. Some people are snotty to me because of it. What they don't realized is I broke her. When I got her she was basically unhandled and couldnt hardly lead and a 3yo. I've done all her training.
The bottom line is don't judge people. Also, comparing yourself to others will never make you happy. As long as you have what you want it shouldnt matter what another person has.
The fact is that you can't change other people, you can only change yourself.