What I have below includes the prologue and some of what I have written. Tell me what you think about it and don't be afraid to tear it apart.
Thanks
~Poem
Prologue
I could tell you that it was easy, choosing to die. I could say I knew it had to be me. That it would be the right thing to do.
But then I’d be lying.
Chapter one~ Part one
A whistle blares. I glance up to see the white ball playing over the net, as if it can’t decide which team will score the point. A chorus of “Mine!” echoes throughout the gym. The ball finally falls to the floor, but the sound of it dropping is lost to the crowd’s screams.
My team, the Eagles, rotates and my sister moves up to serve. Her slight figure quivers in adrenaline. I cup my hands to my mouth and roar, “Go Annie!” She flashes me a wide and wicked grin. The referee blows her whistle and Annie throws the volleyball into the air. Her right arm attacks the ball, like a snake striking its prey.
A perfect serve. The ball crashes to the ground on the other side of the net and the buzzer sounds. The crowds’ heads move in unison to look at the score board; Home- 25, Guest- 17. I grin, and everyone sitting near me cheers and applauds.
All of the girls move up to the net in two lines, so that the teams are separated by the net. They all high-five the players on the opposite team and tell them ‘Good game.’
My muscles scream as I stand up and stretch; the old metal bleachers groan as I walk out of the gym. The crowd disperses as parents usher their children out of the school. I slowly meander out of the school glancing at the blanket of posters and artwork that covers the walls.
I sigh, taking in the deep smell of pencil shavings and sterile cleansers. The large double doors loom before me and I slowly push them open. Sweet autumn air caresses my cheeks as I turn to the bike rack to wait for Annie.
“Hey!” I turn to see three figures walking towards me. They keep walking until they are only about a meter in front of me. “Are you Noah Evans?” The stocky one in the middle asks. His reddish-brown hair hangs in his eyes; he shakes it out of the way revealing a freckled face.
“Yes,” I say reluctantly, “And who might you be?”
“I’m Mike Hanalee.” The stocky one says proudly.
I nod and glance to the right of Mike to where a tall boy stands with a quirky grin plastered on his face. His glasses rest askew on his large nose as he speaks. “I would be Ben, well, my real name is Benjamin, but I prefer Ben.” He merrily sticks out his hand for me to awkwardly shake.
On the other side of Mike there is a smaller brown skinned boy. His sharp face frames two blazing eyes and a wild smirk. “Caleb.” He gives a quick nod as he speaks, and his darks hair parts to show a deep scar high on his forehead.
My breath sweeps out me quickly and I wipe my sweaty hands on my pants. “Alright.” I can feel Caleb and Ben’s eyes on me, but I force myself to look into Mike’s eyes. “Well, I have to go get my sister.”
“How dense are you really?” Mike asks.
“Excuse me?”
“Do you actually believe that we just came up here to introduce ourselves to you? Sorry to jump in on your little ‘fantasy world’ but-“
“Mike!” Ben interrupts.
Caleb, stepping in front of the other two says, “Look Noah, we just have a couple questions. Do you think that you will be able to stay around long enough to hear them?”
“Fine.” I say rolling my eyes.
“Question number one,” Mike declares, “Is your father Joshua Evans?”
“Good Bye.” With that I spin on one foot and start walking away towards the school.
“Hold up!” I hear them call behind me. I stop and turn back around to face them. They are an ungainly group, but there is a deep hatred seeping through their veins.
I want absolutely nothing to do with it.
The setting sun is behind them, and I have to squint to see properly. “Look,” I say. “Whatever it is that you want, I’m sorry, but I don’t have it. I don’t know what you want to find out, so just leave me alone.”
“I’ll take that as a yes then.” Caleb says.
“What?”
“Yes, Joshua Evans is your father.”
“Noah! Did you see that last serve! We won!” My head snaps around to see Annie running towards me. She slows as she sees the other boys in front of me. “Oh… hi.” She says to them.
“C’mon Annie let’s go.” I tell her as I turn around and guide us to the bike rack.
“Hey Evans!” Ben calls to me, “See you tomorrow!”
With a grunt, I yank our large grey tandem bike off of the rack. Annie hops onto the back seat and I grab the front handle bars and start running. Once the bike starts to roll slowly forward I jump onto the front seat and start pedaling.
You're a good writer. In most of the stories I read on here I get sidetracked and do some stuff while I'm reading - it doesn't get me captivated and interested. But, this one, I couldn't stop reading. It was excellent! Also, one thing, some of your sentences are a bit short, I would maybe combine some of them with the sentence after them - other than that there was nothing wrong that I could see. 
That didn't take much nitpicking! ^^