For all those who can't read too much of content, I'll write in a short way.
Focus on yourself; Don't think about others and how they judge you.
Example :
Suppose you are in a washroom and all of the rooms in it as side by side like the image below so that one person can hear the sounds in the neighboring washroom.
You might feel nervous because the person in the next cabin may hear your poop touching water, fart, etc. So, during the whole time you stay in washroom, you won't be yourself and will be in nervous mode because you are always thinking about how that other person might judge you.
But if you ignore it but lightening to music or thinking about something, then you don't really worry about what other person in next cabin is thinking about you.