Alexander Jackson; the Great

I wake up with a gasp. A cold shiver runs down my spine as I sit up, soaking in sweat. The last thing I remember is passing out on the side of the highway after my run in with a monstrous thing with sharp teeth and claws. Now that I think of it, what was that thing? My eyes adjust to the light of day - something that I have grown to hate. Since becoming homeless, I have only ever come out of hiding at night. I realise a girl is standing over me and I instantly leap across the room and grab the closest thing to a weapon I could find - a butter knife. Not really a deadly weapon but in my hands I can make it deadly. She takes a step back and flinches o-so-slightly, but I can tell on the inside she wanted to scream. She talks to me in a soft voice like I'm a psych patient, although I suppose I am the one threatening her with a butter knife.
"Hi." She says, "My name is Annabeth"
"Alex." I blurt out. "What were you doing to me?"
"Helping you." She replies. "You're sick."
As she says it I realise that I am shivering and my hands are very clammy. The butter knife slips out of my hand and sticks itself into the wooden floorboards.
"Where am I?" I ask her, climbing back into the bed I leaped out of.
"Camp Half-Blood for Roman and Greek Demigods" she said proudly. "A sanctuary for demigods."
A sudden realisation hits me. That name meant something to me. I couldn't figure out what, but something's changed. Annabeth sits next to the bed and hands me something that looks like cake.
"Eat this." She said. "It's—"
"Ambrosia." I finish, and eat it down in 2 bites.
She is still stunned that I knew what it was. I didn't even know how I knew, but then a man walks through the doors, around 20 years old, and Annabeth instantly snaps out of it and runs to greet him.
"Happy Birthday, Seaweed Brain!" She yells as she throws herself between his arms.
Ping. I feel another realisation, but I still cannot think of what is happening. About 2 months ago, I woke up in a dumpster without any memory except for my name, my parents names, a few memories of my early childhood and the fact that I was homeless. At first I felt like nothing was new. I just kept on going, doing whatever felt normal to me. But after a while I felt like something was different. I started to realise that I had missing memories.
I felt something telling me to come to this place, whatever it is. I caught a bus, got off at Montauk and a massive thing attacked me. I ran for it. I felt something pulling me towards the ocean, but before I could get there I had to hide in a shallow trench on the side of the highway. The next thing I know I wake up here.
"What did you say?" I ask after I realise Annabeth was staring at me.
"Alex, this is Percy Jackson, my husband. Percy, this is Alex, our newest demigod."
He holds out his hand to shake.
"Hey how's it going bro?" He asks in a friendly voice.
"G–good" I reply, still adjusting to where I am. "Where am I again?"
"Camp Half-Blood." Annabeth answers, "Here," She gestures to the door. "I'll show you around."

Notes

Please let me know how you like it and I'll upload some more!