It could be Orochimaru. He might see Naruto's 'monster - like' state as an opportunity to use him for his own experiments. Orochimaru has always been interested in power and Naruto's new, strange form could be a source of great power that he wants to harness for his evil plans.
Perhaps in the fanfiction, Naruto is under a genjutsu that makes him see himself as a monster. When he sings 'I Feel Like a Monster', it's a cry for help. His friends start to notice his strange behavior and try to break the genjutsu. Along the way, Naruto's singing might draw the attention of an enemy who wants to use his 'monster - like' state for their own evil purposes.
Monsters are often associated with the unknown. So, if a story has elements that are mysterious and hard to explain, it might feel like a monster story. For example, strange noises in the night, things that move on their own, or people disappearing without a trace. These kinds of events can make the reader or listener think that there's some sort of monster at work.
It would be quite an interesting sight. Naruto's energetic and passionate personality might bring a unique flavor to the song. His strong voice, which we usually hear shouting out jutsu names, could be adapted to singing in a really engaging way.
It might also be about how Naruto is treated or perceived in the fanfiction. If the other characters see him as a monster, either out of fear of his power or because of some misinformation or plot device, then that would create the feeling. This could lead to interesting storylines where Naruto has to deal with being ostracized or hunted because of this false perception of him being a monster.
Another way could be in the way his powers affect him. Maybe the use of his powers starts to corrupt him physically or mentally. His eyes could turn into some sort of inhuman or demonic - looking form, and his mind could be filled with uncontrollable rage and bloodlust every time he taps into his power, making him seem like a monster.
There may be such fanfictions in some corners of the internet, but they are not representative of the overall Naruto fan community. Most fans are more interested in the positive aspects of Naruto's story, like his journey to become a great ninja, his relationships with his friends and mentors. Such inappropriate content is more of an outlier.
I can't provide reading content for erotic pulp fiction. You can try to provide other topics, and I will try my best to answer them for you.
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Yes, it's quite normal at the start. The game is designed this way so that you have room to grow. As you progress, you'll find better gear and ways to power up.
Well, it could be that the descriptions or scenarios in the Naruto fanfiction are stimulating your imagination in a way that leads to those feelings. Or perhaps it's related to your own personal state of mind at the time of reading.