Here is the original sentence said by a native american:
"if I hadn't lost some of my hearing, I wouldn't be where I am now. It forced me to maximize my own potential."
Here is a rule from Grammar in Use (Cambridge)
"When we talk about something that might have happened in the past, but didn't, then we use if + past perfect and would have + past participle in the main clause:
• If I had known how difficult the job was, I wouldn't have taken it."
Accordint to the rule the sentence above must be:
"if I hadn't lost some of my hearing, I wouldn't have been..."
Why am i confused?