-In case you haven't noticed, when pot is growing it tends to smell like... pot. Giest is right, there's no way to hide it, especially when you start flowering, if you get that far. Also, like others above have said, you could really fuck someone's life up. namely your parents. If you are in any way a typical high schooler, you'll tell all your little homies about it and the beans will get spilled by one of them to an authority figure in some kind of detention plea-bargain and if the cops get involved your parents could get implicated no matter wether they know about it or not. maybe thats why they wouldn't be happy to find you doing that.
-Trust all these people when they tell you to grow outside. hike up into the hills or into a corn-field somewhere a couple miles from where you live. be smart, scout around, look for water sources. you may be able to divert a small amount of water from a creek with a primitive irrigation system, just make sure people don't go there often. try attaching a dollar bill or a couple quarters to a tree branch or shrub with tape or a rubber band. If its visible and still there after several weeks, your spot is pretty safe. you may need to hike many miles to find a suitable spot. you need Light and water, obviously, but also cover. plant in a clear spot amongst a group of bushes or something, you dont want any light blocked, but you dont want a pungent budding plant standing out by itself for very long either. buy a book on guerilla growing and go that way. if you can get you hands on outdoor seed strains you will have better luck than with bag seed, but any seed should at least grow you SOME bud. want to know how i learned this? by growing some seeds out of some KILLER bud only to realize too late that they were pure sativas and were soon small trees 10 feet tall that I ended up having to harvest early because i live in the pacific northwest and mother nature does not provide the proper climate for budding such a plant. it wiuld have been dead by the time the buds would have been ready in late november. so if you don't know stick with indica and at least you will probably have a shorter flower time. now go buy a book and ask it any more questions that you have
One Love 
let alone if them boys show up at your door... , Look man I'm 31 I am a parent of a 12 y/o and I raised my 20 y/o brother since he was 13 and they got away with some things but not too oftly much, our (parents) "spider sense" kicks in with our own... You gotta already know that you'll get caught... DON'T DO IT..... My advise spend 5 or 10 bucks with your local dealer until you get out on your own...