Most people are too arrogant to learn.
That's not me you're thinking...thank God.
But that is the first sure fire sign- and I include myself here. Think it all the time- when you catch yourself thinking 'but that's not me' you need to take remedial action.
Action not mere 'thinking about it' or castigating yourself.
The action is to put in place a routine where you approach any learning task or new situation saying, "OK I'm arrogant, I get in my own way, but given that let's try and do this."
If you merely identify places and situations where you get in your own way- note them is all you need do, no emotional response required, learning becomes easier.
Learning is really watching and noting.