<human>: Can you give me the gist of the text in a nutshell?

I'm a guy, sixteen years old. Basically, I've liked my best friend for three years, but never had the courage to tell her. I don't know exactly why but I guess it was because I didn't want to harm our friendship. Besides, she's been in a couple of relationships during this time. She just broke up with one of my good friends after more than a year recently. I really like her but rarely express my feelings. Maybe, its because I don't want her to know I like her. The only reason I look forward to school is because I might get to see her, though that doesn't always happen because we aren't in the same class.

But we are both very fond of each other. She often tells her friends how awesome I am. Another reason why I was careful not to let her know was because I was quite under confident. I've never been in a relationship and don't consider myself attractive. I'm really short(but as tall as her) and thin as well.

On more than one occasion, I've told her that I don't like her. But I regret that. I just can't stop thinking about her. And maybe its too much, but I often dream about her as well. So...what should I do? Should I just be friends with her and not tell her? Should I tell her I like her? Anything else?
<bot>: I'm a 16 year old guy. Liked my best friend for a long time. Told her I didn't like her. What do you think I should do?