How do u if your bff girl likes you? we've been friends for a longtime.?

Im not sure im really shy to say i lke her. We\ve been friends for like ever ( 5 years ) and we are like the closest guy and girl friend ever. And i em really bad to asking someone out. and i need some advices to be sure i know. or something that i could make her fall in love with me even more even though i know she has a crush on me.How do u if your bff girl likes you? we've been friends for a longtime.?
say that you really like her and you;ve been waiting for her for a longtime and you need to know if she also like you.

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