hm... The problem is, in writing a novel so young, that you can hardly have read much.
I don´t mean to be offensive, you just did not have the time.
What happens most with very young authors, they run into clichees and overworked topics a lot, because they are not aware just how many versions of their concept are out there. Even if you thought of it all by yourself, it has probably been told already.
Come to think of it, it has almost certainly been told already.
That means you should try to tell your story in a new and compelling way. Do not rely on your plot alone. Also, make characters that can not be described in one sentence.
Make them complex and likeable (Yes, especially the villains).
Apart from that, be aware that writing a novel is a hell of a lot of work. Have you ever written something longer than, say, 20 pages?
A novel will have a few hundred pages, that requires a lot (!) of perseverance and patience. This will not be done soon, you will most likely be a lot older when you finish.
But if you want to go through with it, I would advise plot and charakter planing. Maybe make a chart, how everything should progress from a to b, so as not to lose track of your plot. Also, make yourself familiar with conventions of story telling, such as suspension curves and acts. And if you want to ignore conventions, do so in a creative way.
I wish you the best of luck and a lot of fun with your project.
Oh, and yes, certainly always ask for feedback, and, most importantly:
Listen to it, but do not be disheartened, especially if it is harsch. The internet has no sock in its mouth, if something sucks, it will tell you in no uncertain terms. If you are unsure you can handle it, ask your friends, they tend to have more tact ;-)
P.S.:
Another reason to make your charakters work:
If you don´t like them by the time you are 20, you have a problem. That means:
No angsty teenagers! It has been said before, but it is true. Any teenage charakter is very difficult, because when you are no longer one, you will not have much sympathy for them any more, trust me ;-)
P.P.S.:
Noticed your Nickname. Always go for the archaic male violence! *laughs*