Is it possible to change a girls opinion about you?

Anonymous
I have this really big crush on a friend of mine who I've liked since 2006. but she thinks I'm a smart ass and sarcastic and I try to undermine her and use her words against her.

I don't try to be like that but I'm not real good with girls I never even been in a relationships for christ sake.

I think that me and her would make a great couple but I have trouble not acting like a jack ass and I'm not great at really talking to a girl I like... what should I do?
Is it possible to change a girls opinion about you?
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