How to show a girl im interested in her when she thinks I'm not?

this girl I like thinks I don't like her and don't want to be her friend because whenever she is near me I get nervous and just give short and very literal answers because when im nervous I can't think. she asked why I didn't want to be her friend and I told her I never said that but I like her a lot but I think it is weird to just tell her I like her should I just tell her I like her and get it over with?

How to show a girl im interested in her when she thinks I'm not?
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