They say self esteem is mainly developed in childhood.

That means I should have high self esteem.

I had the happiest childhood and was known as a smiling little kid. My family loved and supported me and I had many friends.

I'm still trying to figure out why it suddenly changed.

I see one of the suggestions stated is to "ask for a hug". I agree.

What if you have no one to hug or even worse, people who are there but don't want to?