Here’s the whole thing:

I’ve.
Changed.
I’m aware of [how] I’ve changed.
The expansion of my consciousness.
The suppression of my body’s aging. {literally “the suppression of the aging process of bodily tissue”}
The [increased] sensitivity of my nervous system.
If I put it into numbers and words, it’s those sorts of material changes that have surely occurred inside me.
But, beyond that “something” is calling out from within me.
That there is a reason that people are alive.
[And that] if I’ve noticed that reason, I have to push on without hesitation.
To pursue the path by which people can understand one another.

For that reason I live, for that reason I fight.
Even if I’m alienated from the rest of the world.
Even if I’m disconnected from humanity’s path.
I’ve.
Chosen to change myself.

I came and fought.
I came alive as I fought.
I never learned any other way to live.
But, that way of life was wrong, and I can see that this world that allows people like me [to exist] is twisted.
Humans, who have no need to hate each other, snatch away each other’s lives… It’s not possible that such a cruel reality could be normal.

And so, I wished.
And I sought.
For a world in which [people] don’t hate each other, or quarrel with each other, and people are allowed to live naturally.
But, how can I create such a world? I can’t think of a method.

Even though I can’t do anything but fight.
Even though I can’t do anything but destroy.
A turning point came to me as I was. {lit. “that kind of me”}
A private armed organization charged with eradicating war.
Celestial Being.
It occurred in [this] world, against each and every act of strife, an armed intervention, set on unifying the world.
Machines were created for that purpose.
Maneuverable weapons to eradicate fighting with war.
Gundam.
Because I was chosen to be a Meister, my way of life changed completely.
It was something I, who can’t do anything but fight, could do.
That’s the reason I live. {he uses a food metaphor, something like “that’s my life’s food”–I’m almost positive there’s an English idiom similar to this but I just can’t think of it}
For that reason.
I fight.