[nunez]

Why? I provided an argument with a source. Also, I wasn't saying that those feelings were immutable; I was just stating the fact that we make somewhat-lasting impressions very quickly on first glance, and those impressions can take time to change.

[vorotato]

You don't have to change your feelings you just need to be aware of them and change your behavior. The moment we become aware of our cognitive biases is the moment we gain the capacity to work against them. It's great that you identified a cognitive bias, but it's not enough to be aware of bias, you need to correct for it. This way your behavior lines up with how you see yourself, and who you want to be. You can correct for a bias you presently have, even if you haven't overcome it. For example I might be biased to say yes to every question, but equipped with this knowledge I can use my conscious mind to correct for this bias, even though I still have it!

As you behave against the bias this will slowly work to correct the biased expectations, because you will have new experience that contradicts previous assumptions.