other people are happier

In the “modern emotional health” webinar, Brooke says that other people are not happier than we are.
When I’m feeling depressed, I always think about a coach who coached me during a program last year (and think: “I’m not like her, she is happy, I’m not, it’s not working, I have a problem…). She is posting pictures of her looking very happy, she says that coaching has changed her life… She looks very flourished, fullfilled and happy. Would it be not the case? I guess she may be flourished, fullfilled, happy and depressed, discouraged, disappointed, sad, angry… sometimes.
It would really be a relief for me to think we face the same emotional challenges…
Thank your for your feed-back!