Shyness exists in every boy and girl. You just care. You don't usually like crowded places, do you? And I don't like to show myself in front of everyone?
The best way to get this mentality is to subconsciously realize that people around you like you, and you should keep telling yourself that people around you like you. This is a method.
And don't always think that others will care about your blushing. Everyone will blush. Why can't you think that blushing will be cute and beautiful?
Think about it, why did you invent blush? That is, girls naturally like red faces, so that they can look like this. The girl who blushes is the most beautiful, understand?