I wrote some stuff about this topic in docs, and will copy/paste it here.
Sorry if it's poorly written, or if some things are worded weirdly, I just woke up and have college almost completely on my mind lol.
Anyways, here it is:
"Amatonormativity is very present in society, and has been for many years. It wrongly assumes that everyone will have the same experience in their lives in regards to romantic relationships and attraction, and this assumption is unfortunately further pushed by a lot of popular media. There are so many movies, books, shows and other forms of story-making that tend to push the idea that you will never be truly happy until you find a partner.
This is often shown by having protagonists who are lost or sad, and at the end of the story they’re completely happy once they get a partner, even if the main plot of the story wasn’t about that specifically. People consuming so many stories like this start to believe that you won’t have a “happily ever after” if you don’t get a partner. This expectation spreads among other people, who also consume this media all the time, and thus begins the assumption and expectation that “everyone will want a relationship or they won’t be happy.”
This expectation puts a lot of pressure onto aromantic people, and can even make them believe it too. It can make aro people feel like there’s something “wrong” with them, or make them worry that they’ll forever feel incomplete and lonely until they get into a “standard” relationship (monogamous, no QPRs, ideally straight according to mass media).
I also feel that this especially puts pressure on women, who are often expected to get married and have children at some point. As a woman, I have been asked questions like “have you met any boys yet?” and I’ve been told things like “one day, when you get a boyfriend, you’ll blah blah blah”.
Going back to the point about media, it’s especially frustrating for me to see so many female characters have this story arc where they think they don’t need a boyfriend, but after meeting the protagonist they realise that they actually did need one and were just being “edgy”.
In conclusion, I think that the previously established amatonormative expectations are only being further fueled by mass media like movies and shows. I think that we should try to make more stories that include characters who are happy without a partner and aren’t considered weird by everyone else. This would educate people that you don’t need to be in a relationship in order to have a happy ending, if you don’t want to."
I hope this is helpful for you :)