I'm sorry to hear that; I went through the same type of thing so I know how it is both painful and also lonely or empty too. We are not alone. Once there was a thread here about the "mother hole" and it was amazing how many people responded and how similar everyone was, even right down to where in their bodies they experienced these feelings.

Attunement and empathy are crucial all through life, but most crucial with that early attachment. It even can affect brain development. Thing is, it can be changed. Not that you can ever undo that experience really, but you can create relationships, particularly in therapy to start with, that are safe and attuned. Then things are more possible outside of therapy.