You must be aware of what you are doing when taking care of your credit cards. You need to make sure they are secure as your cards include all the information relating to your finances and much more. There are several identity theft protection tips that you can use to keep your cards safe and less likely to be stolen.
Be aware of how you are handling your credit card receipts if you get them. Keep your receipts in a secure space so no one can take information off of them.
In fact, you might be better off asking for no receipts when using your cards. You can ask to get your receipts sent to your email address, so you don't have to share your content with others in this situation.