We have this tendency to become self-conscious and think people are looking at us and judging us. They aren't. And if they do, it's only temporary until the next person they see.
The reality is that most people are too busy thinking about their own insecurities to worry about you. Some will watch in amazement. Others will not give a shit.
Don't allow the possible opinion of a stranger to dictate what you do with your life. Even if that person is in a position to hire you, you're more likely to be looked upon in a positive light for being bold.
No excuses!