How to confess to my crush?

Ok so I like this guy a lot, I know he likes me back cause he told my friend who told me. The thing is we don't talk that much but when we do it's pretty amazing. How do I tell him I like him, I've never confessed cause no one has ever liked me back. How do I not make it awkward. Remember I'm 13 (almost 14) so I can't really do anything that big :)
How to confess to my crush?
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