How do you tell your friend that you like her?

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I have a friend and we have known each other for quite some time. I suddenly woke up one morning and I felt that I liked her that much. She was more than a friend to me. I think I have fallen for her. She is real popular at her campus becasue she is really pretty. As far as I know, many guys are courting her but still she does not entertain them. I really liked her and I want to tell her how I feel. The problem is, I don't know why. I am also afraid that she might stay away from me and I really won;t like that to happen. So please give some advice on how to tell her that I like her in a way that it wouldn't be so much surprising to her.