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How to overcome shyness around guys 
Realize that not everyone is looking at you. 
This can be the hardest part about talking to a guy, is that it can feel like everyone is watching you. Most often, this isn't true.
People are most often too absorbed in their own lives and preoccupations to notice whether you're nervous or doing something weird. However, most of the time when people are shy, the shyness isn't visible to others.