How do I change my mentality towards men?

I grew in a healthy family, but external people and my aunt and grandma since I was little fed me the idea that men just like a woman because of the way she looks and that the most important thing for them in a relationship is sex, that basically they don't feel like women do. And, I know that's not true, I know guys are really sweet and that this thoughts are bs, but that idea was implanted in my head without me even realizing and now I'm 20, trying to get that out of my head and can't find a way to do it, it's annoying to have that in my head when is not what I believe in.
How do I change my mentality towards men?
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