I'm happy to help! Here's a revised version of your narrative with grammatical corrections and some stylistic adjustments:

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From the time I can remember, I found myself in the Old Orphanage, cared for by the Old Nun—bless her soul, as she's no longer with us. I knew I looked different from most kids, but it didn't matter; I still cherish those days filled with fun.

As time went on, I learned that I was Asian-American, a term the Old Nun used. In my younger days, I proudly flaunted my "Asian-ness," even though I had no real understanding of what that meant, believing that all Asians must love each other.

I grew up in an orphanage in Chicago, learning and struggling not just physically but emotionally. The moment I realized that the Old Nun and Father weren't my real parents was heartbreaking.

I cried and cried, comforted by fellow orphans who either had endured similar pain or simply cared for me.

Years passed, and after a challenging teenage period, I finally turned 18. A few of my fellow orphans weren't as fortunate, succumbing to the pressures of running away, drugs, or diseases that the orphanage couldn't treat due to a lack of funds.

My best friends, Jack and Peter, and I knew that Father Alphonso would try to find us jobs to help us become independent enough to leave the orphanage, just as he had done for other 18-year-olds. With the Old Nun gone, her death left me with a whirlwind of feelings I couldn't explain to myself, let alone to anyone else.

We three understood that even if Father Alphonso managed to arrange jobs for us, we wouldn't be able to afford accommodation. He would likely let us stay in the orphanage for another year, but we'd be sleeping in the hall.

We wanted to help Father as well as make the Old Nun proud. Despite her passing, we believed in the other world she had taught us about, although her death made me question everything she'd ever said.

So, Jack, Peter, and I decided to join the Marines. We spent nearly a year preparing for selection after turning 17. As the youngest among us by just a few months, I celebrated my birthday before heading off for the trials. All three of us wanted to serve the greatest nation in the world and support the orphanage, like sons caring for their families. Even if we weren't true brothers, even if the Old Man wasn't our father, and even if those kids in the orphanage weren't our younger siblings, we still wanted to do it. Why? Who knows? Maybe we were just crazy.

Jack, Peter, and I were accepted into the U.S. Marines. We went through boot camp and were deployed to Afghanistan, but we hardly saw any action. Most of our time was spent patrolling villages and performing guard duties. Neither video games nor other distractions could relieve the stress of our monotonous and risky lives.

One day, Jack introduced us to anime, manga, light novels, and web novels. Reading had never been my strong suit, but with so little to do, I dove in. We watched shows like "Naruto" and "Dragon Ball," but one of my favorites turned out to be a lesser-known web and light novel: "Mushoku Tensei."

I loved that story; it provided an escape from reality, a "what if" scenario. However, I wasn't young enough to remain entrapped in such delusions, and being in a war zone kept me grounded. I think I connected with "Mushoku Tensei" because Rudeus's mother was named Zenith, which was also the name of the Old Nun.

One day, during a routine patrol, our unit was ambushed by hundreds of Taliban fighters. An intense battle broke out, and I was severely injured. I saw Jack and Peter dragging me and one of our fellow team members, John, toward a more secure location.

Medic Khalid came running toward me, but everything faded to black. My last thought was a wish to have met Zenith at least once, to have saved her.

When I woke up, everything was too bright. Did I survive? Man, I must be tough. What the hell? Why is there such a big muscular man? Where am I? Wait… why is everyone so big? What is happening? I then checked my hands and saw a child in the eyes of the huge man. Did I just reincarnate? Oh crap, did I just poop?