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He didn't change his personality, the rod did by damaging his brain.

Also, I don't believe personality changes with age. Personality traits become more pronounced. I think anyone that has ever known anyone from adulthood to elderly (or who works in a retirement home/village) knows and believes this.

So if I stuck a metal rod in my head would

1.) the rod be sticking itself in my head

or

2.) me sticking the rod in my head
 
I was able to, I maintained a completely different personality for 3 years, the altered personality made me much more socially acceptable around my peers. However, I have reverted back to my old personality as I find it much more comfortable.

I do revert to my altered personality from time to time.

If you sometimes revert, then surely the answer is that you cannot change?

You are temporarily modifying your persona, not changing it.
 
In my opinion, your core personality forms as a kid, and while you will change over time, you're not likely to make any sudden dramatic changes.

I guess if you put in the effort to change, but its hard to change who you have become naturally.

Damnit, I'm screwed then. I'm in the process of "formatting" my personality so I can function in a normal life. This requires me to pretty much destroy all memories from childhood (it's not that I enjoy remembering them, but they have a pretty big effect on me).
 
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