Advice
Do not be timid. If you have social anxiety or are shy, cashiering can be a struggle. Customers are generally kind to new employees, however. If someone is impatient with you or treats you with disrespect, realize that this does not reflect on you as a person. Simply do your job and treat the customer with respect (even though they have not deemed you worthy of theirs). Remember, you will likely never see many of these customers again. Be friendly, but do not take anything said cruelly to heart.