to the OP: i posted a question like yours on this forum about two years ago. now i'm a regular poster over on the "getting clean" thread, as i try to kick this fucking habit. that doesn't make me an expert or anything, just a fellow traveller.
a couple thoughts that i hope will help you.
0. please find a way to get help with your depression. is there anyone at school (a teacher or something) who you trust enough to talk to about it? i tried to kill myself at 16 but a teacher helped me get to a psychiatrist and now i'm very glad i didn't succeed. you have TONS to live for, you just haven't found all of it yet.
1. folks on this thread are absolutely right that heroin is glamorized all out of proportion. from an experiential standpoint, a heroin high isn't going to get you a lot more oblivion than you can get from enough of most any other substance. in other words, you can get fucked up enough to forget things on almost any substance, including many that are less nasty than H. i can get almost as blasted on some top-notch shatter as i do on street dope. of course they're not the same: but if oblivion is your goal, you can find that in less harmful places.
2. if you *are* going to do heroin (and given how i've seen similar threads go, you probably will), i strongly recommend that you don't IV it. sounds from an earlier post like you're in the chicago area. if that's true, any H you get will probably be so-called #4, which means you can snort it or smoke it (or plug it). injecting is awful for several reasons:
a) much less latitude for dosage errors, especially for someone without a tolerance. in other words, super easy to OD.
b) awful for your body. missed shots, dirty rigs, damaged veins, cotton fever. fuck that. basically, by injecting, you're circumventing every natural protection that your body has in place.
so if you're going to do it, my advice is: start with a tiny amount. choose an ROA (route of administration) other than IV. have a sober friend nearby with some narcan (generic = naloxone), a drug that can save your life if you do OD. many public health departments in the US offer it for free and anonymously. just google naloxone and the name of your city or county to see if you can find someone who can hook you up with it.
good luck and be as safe as possible. keep the questions coming. no judgment here (at least from most of us
).