Your body does not know what a boy is. It does not differentiate between “boy anxiety” and any other type of anxiety.
It’s possible to separate the two concepts in your mind: The boy on one side, and anxiety on the other. Deal with the anxiety, not the boy.
A great start may be to simply leave your phone in another room. A boy is made of organic matter; a phone is made of silicon and plastic.
Separate the two. Breathe.