To be honest, I haven't heard of the word "groupie" before, until I read an article about the groupies story of Chinese rock.

-"had not/hadn't" should be used instead of "have not/haven't"... hopefully this reddit link with an example works! https://www.reddit.com/r/EnglishLearning/comments/a49wcs/hadnt_vs_havent/ebdkqau/?utm_source=reddit&utm_medium=web2x&context=3
-Based on what you wrote later, it seems like the article wasn't about a specific "story," but instead it was about groupies who followed Chinese rock music in general. Based on this, I thought it would be more appropriate to exclude "stories"

And itThis was posted on International Women's day, it's really as a very specialunique way to celebrate the festival.

-Recommend not starting sentences with "and"
-Nothing wrong with "special," I think saying "unique" would work better here though

Groupie iss are a group of girls who pursue rock band boys with their bodiesexual intentions.

-Changed a bit because it should be plural
-I get what you mean by "with their bodies" but I think the correction I made may sound more appropriate

In the vigorousliveliest era of rock music, groupies attached to thehemselves to musicians and regardedsaw themselves as music devotees.

-I think a word like "liveliest" may fit what you're trying to say better
-clarified what you meant by groupies attaching... although I may have made it more repetitive by using "themselves" twice
-there's nothing wrong with "regarded," I just changed it to "saw" as it is less formal

At the same time, they also regardviewed the musicians as consumer goods.

-Regarded was fine here but I think "viewed" works better in my opinion!

SoBecause of this, I know very little about Chinese rock culture.

-Added a bit to make it a full sentence
-added "very" in front of little for stylistic purposes

In addition, because in China, it's very conservative in terms of sex, I'm surprised that groupies actually exists in China.

-Fixed the flow

Compared with foreign countries, groupies in China have been humiliated by more sluts.

Not 100% sure what you mean here - have groupies in China been humiliated by being called sluts? Or have they been humiliated by the sluts themselves?

After a popular variety show called "Summer Of The Band", there whas been more discussion about groupies.

-Changed it to "has been" because I believe that the discussion about groupies is still present and happening. "There was" may be more suitable however if the discussion about groupies has stopped

However, many outsiders believe that groupies are related tohave "no self love" and "no self-esteem", whoas they materialize themselves andto become men's accessories.

-Not 100% sure what you mean by "outsiders" - is this referring to people who are not groupies? If so, you could substitute "outsiders" with "many people" or even just "many"