Judge your accomplishments by your own standards and not anyone else's! This doesn't mean that you have to set the bar low! Quite the opposite, set the bar as high a possible and maybe a little higher. What it means is that you should make peace with yourself instead of allowing others to make you feel miserable. If you allow others to measure you by their standards that is a recipe for dissatisfaction.
Let's look at an example: I'm a sales process and tool specialist and work on a project with a finance controller. My finance skills are sufficient for my area but I'm by no means a financial specialist. If I allow the controller to measure my financial skills by his standards I have lost. I'm in this project because of my sales skills and NOT because of my finance skills. Keep this in mind the next time you judge yourself too hard or allow someone else to judge you too hard.