You're never going to be flawless and you must know that. You have a need to compare yourself to other people though, so maybe it would be good to focus on what you're good at and find people who aren't as good to compare yourself to. Maybe that doesn't work though.

Try to focus on something good, whatever good is to you. Hobbies, talents, good deeds, etc. The time you spend thinking about what you can't do could be spent thinking about the things you can do. Other people do this and it works, so maybe it could work for you too if you stayed dedicated to it.