you can't, unless you're severely insane or lobotomized
it's better to learn how to handle it healthily, shame is a natural part of sociality
when you feel ashamed, you feel rejected by the others due to your behavior (regardless if they're actually rejecting you or if it's just your imagination)
it's a "conformity enforcing emotion", so ask yourself why you feel ashamed whenever it happens and then decide whether said shame is justified and try to change your behavior or if it's injustified and stand your ground