The reason "I'm from the muggle world" is good, but when you repeat it again and again it become something annoying, He is not the only muggle born in Hogwarts, Hermione was also from muggle world but she didn't cry about it everytime.

This doesn't make any sense, no goal, unclear story, unclear path, what does he wanna really do? He don't want the story goes astray but he always touch the storyline, he can't just watch he always want to be there, he always talking to the trio like he wants to be a part of them. Dropped