some older narrative

I can't say for sure I am who they told me I was twelve years ago this Spring. I woke up completely tabula rossa (blank slate memory) and it took days before they showed me a Mass driver's license with a conspicuous date under DoB and a basic cursive signature in the lower corner. I was told by the hospital intake staff I was to sign that signature to commit myself voluntarily or I'd literally never see the outside. They found his parents, I told them i knew nothing but this doesn't sound like my name when they say it. They told me they recognized me as him, and told me a personal nickname that did feel familiar, and later became my legal name. However, I feel funny claiming that as the identity I'm changing from, as i didn't recognize the hair pattern in the ID, and based on facial structure, I think this may be a younger brother, still out there and struggling with medical anonymity.