A lot of people's minds are raised from a young age to make judgements and comparisons with others. Their minds are told that one must be useful to be valuable, and that simply _being_ isn't enough.
Over time those bad habits of the mind are so ingrained and automatic that we assume them to be part of "me". "My" thoughts, "my" ideas and so we don't question their assumptions or where they came from.
It takes conscious effort to be able to change those habits into something more positive, or to be able to center your mind to a point where those habits seen as just other thoughts and don't have the same "weight" behind them.
We're an ever changing process and being able to judge and adjust is a useful skill. It's just that doing that doesn't require all of the crap we put ourselves through due to unchecked assumptions.
Even diogenes the cynic who scorned society reproached himself when shown he was not meeting his own standard as well as he could. He lived simply and had but a cup to drink from. Then he saw a child drinking from a stream and smashed his cup in frustration at not having thought of the child's simpler approach.
Anyway my comment was aiming at illustration what high self worth or lack thereof may feel like, rather than what one should do.