I was a fat-headed guy, full of pain.
I began by acting like the person I wanted to be, and eventually I became that person.
One pretends to do something, or copy someone or some teacher, until it can be done confidently and easily in what becomes one's own style
I pretended to be somebody I wanted to be until finally I became that person. Or he became me.
I can't bear to hear a woman talk baby talk.
I'm a fatheaded guy, full of pain. It tore me up not having you.