Ok what effect me personally
Class - I don't get millionaire's privilege, but I get every right I need. (I'm not really sure how you define class so I guess it's about money in the pocket, if so I guess I'm in the middle to low)
Race - I'm Asian and I have black boyfriend and plenty of white friends from around the world. So far I have no big races issued in my life like being kick out of somewhere because my race, but still some small races issue which I doesn't really care. But my boyfriend told me that in 90s it was different. And in my home country, Thailand, people are prefer to have white skin rather being dark skin. I don't think it's races, it's more like a skin color preference. They think having white skin look better. And in the Asian community I know some people that judge people from skin color, like white skin = good people and black skin = bad people. But overall, it's not a big deal and it's doesn't effect my daily life. May be I live in the place that this issue is not the serious issue.
Gender - I'm a transgender, yes sometime I get treat different. But again I live in the place where being trans is super normal. So I don't get treat like CIS but I'm ok with how I being treat. But there are place where it seriously need to fix trans right issue, like in Russia, some Muslim countries and many more. I have friends in these places and what they facing is terrible treat from people in their country.
I think people have to realize that everyone is different, and just respect their difference. Races and Gender issue still exist in my point of view. I am ok because I choose to avoid it by living in the place that is ok and socialize with the acceptable communities.
And these issue is vary in different places. I think you might want to be more specific on your study. Good Luck with your study