Why does my brothers girlfriend dislike me?

I've been trying to connect with her and talk to her or even make a joke so she can laugh.. but every time i talk she gets quiet and leaves me looking dumb and then my brother has to say something so it doesn’t turn awkward. I try really hard to get close to her but she never really wants to engage into anything.. I don't know if it’s my brother or her but it’s kind of off. And then sometimes I feel like I’m too loud or make things more awkward so then I kind of just walk away. She gets along with my parents more than me and it makes me feel kind of sad because I actually do want to be close to her. I don't know maybe I’m just annoying to her or something but still makes me kind of sad :/
Why does my brothers girlfriend dislike me?
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