Adopting the Principle of Pro-feminism

I feel that sexism is a very powerful topic. One way that I perpetuate sexism in my life is through school. In school we have many gender roles. For example, in P.E. class girls are expected to just stand in the corner, and when they are actually participating you think they are mascualine and somewhat acting out of there typical character. I feel that I do not perputrate sexism because when I look at an add I dont just look at the women and thats the sole reason I would by a product.