There might be. Fanfic authors like to take the characters from the Naruto series and put them in new and interesting situations. Since Naruto and Hinata have a relationship in the original series, it's possible for a fanfic to show Naruto having a significant moment with Hinata that could be described in an interesting way, like a moment of great courage or determination that might be related to what you're asking, but it depends on the creativity of the writer.
He might show his scars to Sasuke. Given their complex relationship, it could be a powerful moment between them, a way to show Sasuke that Naruto has also faced great pain in their separation and the events that followed.
In some fanfictions, Naruto's pain might manifest through his actions. For example, he could become withdrawn and isolate himself from his friends. This is because Naruto has always been a social person, so any deviation from his normal behavior could be a sign of his internal pain.
One possible cause could be his sense of failure. Naruto always wants to protect his friends and village, so if he fails in a mission or is unable to save someone, it can cause him great pain.
Well, one possibility could be that Naruto shows his memories to his friends to make them understand his past struggles better. For example, he might show them his lonely childhood, how he was ostracized by the villagers. This could lead to a deeper bond among them as his friends truly empathize with his journey.
His closest friends like Sakura and Shikamaru would be very interested. Sakura, as she has been through a lot with Naruto and always cared about his well - being. Shikamaru, because he is intelligent and would want to understand Naruto's motives and past experiences better to strategize better in future situations.
In the context of fanfiction, it might also be a plot device to explore Naruto's vulnerability. It could lead to new character developments, such as others seeing him in a new light. Maybe it causes some characters to re - evaluate their relationship with him, while for others it could be a source of inspiration, seeing that even someone as strong as Naruto has his own set of hardships.
Naruto in fanfiction shows his emotions by how he interacts with his environment. If he's feeling down, he might not take care of his training ground as well. When he's feeling energetic and positive, he'll be all over the place, improving and adding new things to it. And of course, his reactions to news are a big indicator. If he hears good news about his friends, he'll be overjoyed and start celebrating right away.
In some fanfiction, Naruto might become disinterested in Sakura because of a change in his ninja career. For instance, if he is assigned to a long - term mission far away from the village where Sakura is. During this time, he meets new people and has new experiences that change his perspective. He could also start to value different qualities in a person. Maybe he used to like Sakura's determination, but now he realizes that there are other qualities like kindness and acceptance that are more important to him. And Sakura doesn't possess these new qualities he values, so he loses interest in her.