Why can't I be myself around this guy who I really like, how do I fix this problem?

This guy and I have been talking for awhile like 2 weeks like we have been talking about getting together but we have known each other for like a year. but it was on and off talking through out that year.. I have plenty of guy friends and I can act myself around them, like completely myself but around this guy its different I get quiet and shy ..

What should I do to fix this
Why can't I be myself around this guy who I really like, how do I fix this problem?
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