Hinata misunderstands Naruto, she doesn't know that his greatest pain was loneliness. She assumes his greatest pain was being underestimated because that is her greatest pain. It's all about Hinata, not about Naruto (not surprising since naruHINA is all about Hinata anyway).
So true. I always wonder exactly what NH fans -- or really anyone who still fears the possibility of NH, for that matter -- think would happen...? I mean, let's say Hinata did get Naruto's attention. Then what? She doesn't know him, they have little in common, and they are complete opposites in every possible way.
Assuming she could ever get past her cowering, stuttering adoration of him, despite the one moment in #615 I don't believe Hinata has the personality or perspicacity to offer Naruto the sort of partnership and challenges he needs to grow. Hinata is a nice girl, but the truth is that while being together might be very fulfilling for her it would be a life half-lived for Naruto.
And really, that's the whole point of the romance plot for Naruto. Finding a challenging, fulfulling partner who will not only erase the pain of his lonely childhood, but step into the future with him and complete the destiny of his parents that was cut so short.
Sakura is that partner. She doesn't just know him, she understands him. They have many life experiences in common. Their personalities and talents are different enough to be interesting, but similar enough to mesh and complement each other.
The thing that's really cool? Naruto is natively aware of his body and operates on instinct. When he was just a kid Sakura was the one he was drawn to, the one he knew he wanted -- even if his mind couldn't tell him why. His soul knew it.
That's why Hinata never has been and never will be the right girl for him. He would have to choose her with his mind -- completely ignore his instinct by force -- and that's not who he is. Like I said, if he did that it would be a life half-lived at best.
The journey to understand her soul has taken Sakura-chan longer -- the downside of being in her head more than Naruto is ever in his -- but we can see the evidence that she is gravitating toward him. When she figures it out there will be a very loud, symbolic click as everything falls into place for them. Kishimoto has painstakingly posted signs along the way, letting us watch Naruto and Sakura grow as individuals as they grow toward each other.
I know a lot of this has been said before by myself and others here. I just felt like saying it again.