Why is it so awkward?

Whenever I'm talking to a guy that I like, or just in general, it gets really awkward. The whole time I am thinking "I hope there isn't an awkward silence!" What can I do to be less nervous, and create more conversation instead and saying straight up, "What sports do you do?" "What do you do in your free time" That sounds to.like weird.
Why is it so awkward?
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