It is okay to live a life that others don't understand. This means that you are under no pressure or obligation to explain how you choose to live your life to anyone.
Have you ever wondered what the world would be like if everyone decided to mind their business? Well, that is not the world we live in right now. We have family members, friends, and relatives who are always looking for a way to inquire about how we are living and how we are able to keep up with that lifestyle. Sometimes the pressure may get too much and you find yourself explaining to each of them over and over again. It does not have to be so, you can decide to live your life and be comfortable without trying to make people understand how you live. You are an individual with separate tastes and needs from every other person, and you have to be okay with this knowledge.
So whether it comes as a question or a comment about how you choose to live, remember that you don't have to try to make them understand your life.