What's the alternative? Be bitter like you? Don't have goals and don't try to do anything in life? You miss 100% of the shots you don't take. Life is too short to worry about failing and worry about what other people think of you. If you have a bad day speaking, oh well, there's always tomorrow to try again. Besides, everyone has their own problems, nobody is even thinking about you, let alone remembering you. They go home and deal with their own shit. So you might as well just be yourself, flaws and all.