Prepare for a hailstorm of posts. :)
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Hermione had always known she wasn't good at making friends.
Her brashness and general social awkwardness took care of that, but she tried anyway. Two boys in her year, the famous Harry Potter she had read about in her books and a boy named Ron Weasley caught her eye. They both looked scared as well.
She introduced herself, trying to be nice, but her nerves were too much; she tried to show off. When she left the compartment, her confidence left with her.
She never told anyone how upset she'd been that they didn't like her.