Well, low self-esteem primarily comes from how you're treated by your parents. That's the critical relationship that will determine your self-esteem. How your parents tell you you are is how you will believe yourself to be, so you internalize what you hear and that voice becomes your own voice. Then in the teenage years, there is more work, let's call it, on the part of the teenager in developing their self-identity and self-esteem. It's very fragile until they get to around 18 or 19, when they start to realize that they can be individual. They can have their own views, and it's okay to have those views.
On April 4th, 2017. See this statement in context.