As long as you're feeling okay about yourself, then there's really not much difference between what you think and what everybody else thinks. You are entitled to your estimation of yourself, the rightness of your action, so on and so fort.
What this created is self esteem that produced a very hollow self confidence. People definitely can feel that they can do stuff, but they can only do it in theory. When they're actually given challenges to produce and deliver results, most people, who focus primarily on self esteem without the matching competence, fall apart like a house of cards.
Self esteem without competence is a recipe for failure. If you're having a tough time in any area of your life or you feel you're frustrated or stuck in any area of your life, maybe it's because of this. Sure, you feel good about yourself and it seems like you have a high estimate of your ability to get things done.
Unfortunately, unless and until that high estimation is based on actual experience and results, you're just wasting your time. It's probably going to be very hard for you to overcome challenges. It's probably very tempting for you to just quit the moment you're confronted with actual difficulty.
If you're suffering from any of these, thankfully there is a fairly straightforward and simple solution. Grab a copy of this book for a solution to your suffering and you will be glad you did.