Hey! I'm also 16 so hopefully I can help you out a bit... These are all some of my favorite books of all time... My descriptions are from Borders.com because I'm not very good at describing books.
Gone- by Michael Grant (series)
* In the blink of an eye. Everyone disappears. GONE. Except for the young. Teens. Middle schoolers. Toddlers. But not one single adult. Just as suddenly, there are no phones, no internet, no television. No way to get help. And no way to figure out what's happened. Hunger threatens. Bullies rule. A sinister creature lurks. Animals are mutating. And the teens themselves are changing, developing new talents--unimaginable, dangerous, deadly powers--that grow stronger by the day. It's a terrifying new world. Sides are being chosen, a fight is shaping up. Townies against rich kids. Bullies against the weak. Powerful against powerless. And time is running out: On your birthday, you disappear just like everyone else...
*Book 2- Hunger
*Book 3(out in May)- Lies
Two-Way Street- Lauren Barnholdt
*This is Jordan and Courtney, totally in love. Sure, they were an unlikely high school couple. But they clicked; it worked. They're even going to the same college, and driving cross-country together for orientation. Then Jordan dumps Courtney -- for a girl he met on the Internet. It's too late to change plans, so the road trip is on. Courtney's heartbroken, but figures she can tough it out for a few days. "La la la" -- this is Courtney pretending not to care. But in a strange twist, Jordan cares. A lot. Turns out, he's got a secret or two that he's not telling Courtney. And it has everything to do with why they broke up, why they can't get back together, and how, in spite of it all, this couple is destined for each other.
I'd Tell You I Love You but Then I'd Have to Kill You- Ally Carter (series)
*Cammie Morgan is a student at the Gallagher Academy for Exceptional Young Women, a fairly typical all-girls school'that is, if every school taught advanced martial arts in PE and the latest in chemical warfare in science, and students received extra credit for breaking CIA codes in computer class. The Gallagher Academy might claim to be a school for geniuses but it's really a school for spies. Even though Cammie is fluent in fourteen languages and capable of killing a man in seven different ways, she has no idea what to do when she meets an ordinary boy who thinks she's an ordinary girl. Sure, she can tap his phone, hack into his computer, or track him through town with the skill of a real 'pavement artist''but can she maneuver a relationship with someone who can never know the truth about her? Cammie Morgan may be an elite spy-in-training, but in her sophomore year, she's on her most dangerous mission'falling in love.
*Book 2- Cross My Heart and Hope to Spy
*Book 3- Don't Judge a Girl by Her Cover
*Book 4(out in June)- Only the Good Spy Young
Shadowland- Meg Cabot (series)
*Suze is a mediator -- a liaison between the living and the dead. In other words, she sees dead people. And they won't leave her alone until she helps them resolve their unfinished business with the living. But Jesse, the hot ghost haunting her bedroom, doesn't seem to need her help. Which is a relief, because Suze has just moved to sunny California and plans to start fresh, with trips to the mall instead of the cemetery, and surfing instead of spectral visitations. But the very first day at her new school, Suze realizes it's not that easy. There's a ghost with revenge on her mind . . . and Suze happens to be in the way.
*Book 2- Ninth Key
*Book 3- Reunion
*Book 4- Darkest Hour
*Book 5- Haunted
*Book 6- Twilight
The Only Alien on the Planet- Kristen D. Randle
*New town, new school, new friends. It was difficult for Ginny at first, but her senior year is finally starting to feel kind of normal. That is, until she sees him—the beautiful mystery in her English class. He has never spoken a word to anyone. He moves through each day at school without making eye contact. His name is Smitty Tibbs, but everyone calls him the Alien. Ginny is convinced there's more to the Alien than his muted exterior. But as she attempts to break into his safe and emotionless world, she realizes her efforts might be causing more harm than good. Has she gone too far, or not far enough?
Eragon- Christopher Paolini (series)
*Fifteen-year-old Eragon believes that he is merely a poor farm boy--until his destiny as a Dragon Rider is revealed. Gifted with only an ancient sword, a loyal dragon, and sage advice from an old storyteller, Eragon is soon swept into a dangerous tapestry of magic, glory, and power. Now his choices could save--or destroy--the Empire.
*Book 2- Eldest
*Book 3- Brisingr
Hopefully I helped!