I'm ashamed of my cultural heritage
Why are you ashamed of your culture?
In my country, women are treated worse than men.
Women should never be treated worse than men, that is sexist. Think about the good points of your culture, there must be something like the food, dress, and so forth. Concentrating only on the negative aspect will bring you down and make you feel ungrateful for everything.
I don't think my perspective is going to change.
You should read more about history and heritage, socialize with people of the similar background. I'm sure that'll help to change your views.