For many people, how they value or see themselves comes from other people.
This might be great when people are treating you well and constantly telling you how great you are but when not so much when you’re treated and being spoken of poorly. You go from feeling good about yourself to not feeling good enough.
Then you end up feeling stuck because you were always so reliant on other people to determine your self-worth that you don’t know how to stop.
And so, you feel down and worthless whilst also blaming other people for how you feel. I think that stage of blaming others continues until you’re able to realise that nobody else should be in control of how you feel about yourself. That’s not a solid foundation.