The song talks about how a person may seem like they are doing well based on their outside appearance, however, what they are feeling, what they are going through isn’t the same as your assumption. The lyrics talk about how a person is doing ,mentally, and why they hide what they’re feeling. There are several reasons as to why someone would hide their sadness, it could be the prejudice against depression, it could be because they feel as though no one else feels what they are feeling, it could be due to embarrassment, or it could be because of something else. No matter the reason, not everyone who looks happy, is happy.