Shellie, I mean this in the kindest way.
You may well need the support of others in this that are going through the same thing. Perhaps there's a group at school or your church if you go to one that you could join.
Nicotine is seriously addictive, as you know. Also, trading one addiction for another, as you so frequently see in the cult that is AA, is not necessarily good. If you set your sites on playing your cello and that doesn't work out for whatever reason, that failure could move you right back into the habit you're trying to quit.
Quit so you can run a mile in 7 minutes. Quit so your clothes and breath don't stink. Quit to save money. Quit for your own self esteem and the satisfaction of being in control of yourself. Quit to thumb your nose at the people and companies that are willing to kill you in a horrible fashion so they can spend your pennies. Quit so that if you have children they will be healthier and live longer. Be an example for those, once your success has been cemented, who wish to quit but think they can't.
And, if along the road you fail, get your butt, lol, off the ground and start over NO MATTER HOW MANY TIMES IT TAKES until you succeed.
Do it for you. You don't have to do it alone.