We are all wrong from time to time. We may have held incorrect opinions. There is some shame in that, but the truly shameful thing is to deny that it happened and refuse to learn from the experience.
We have to take some time to reflect on our own behaviour, and acknowledge our errors of judgement and more importantly the lessons we have learned.
Then we share with others. The more you do this the more people trust and help you. Its a critical step to move away from defensive behaviour.
Once you are open to discussing your failures or lack of judgement it becomes easier and becomes part of your everyday behaviour.
Other benefits is reduces time spent emotionally trying to process or protect the position.
When you have made a mistake, face into speaking up immediately and ensure you are clear on the implementation of the learnings .