I'll give you a full breakdown on accutane and my personal experience:
First of all, the bottom line is it works, it's just strong. Thus it's not usually recommended unless absolutely necessary, that being said it seems like your acne is strong (just as mine was) and it WILL get the job done.
Things to note:
1. Don't drink while you're on accutane, at all. They'll tell you that you can't drink, and assuming you're in high school you'll want to, but DON'T. That shit is strong, it really fucks with your liver and you could end up in the hospital if you're taking the drug correctly and also drinking.
2. Stay on the regiment, don't skip pills and follow the dosage they give you to a tee.
3. Initially, you will break out more than you start with - that's just how it works. It severely dries out your body and it will cause you to slightly break out first. After that you'll see the acne slowly begin to clear up. While you're on the drug, do NOT pop any pimples, the scars are a bitch (and I have a few of them still unfortunately).
4. Dryness will be a bitch. You'll need to carry lotion and chapstick around with you all the time. Chapstick I recommend is accutane, it's glossy and looks sort of like a lip gloss but that shit works like a miracle and will really be your best friend. Also any type of lotion works, but get face and body lotion cause you'll feel like a dried fruit throughout the majority of the process.
5. As your dosage gets higher, the dryness does as well. At one point my dryness was so bad that I'd wake up with "burn marks" for lack of a better way of describing it because sometimes my skin would get so dry that the skin on my arms would crack and I'd have burns on my skin.
6. There's a stigma that it affects your mood and people get "depressed" - I think that's bullshit, I didn't feel any of that while I was on it
7. My acne was bad when I was in high school, I was on it for 9 months and it cleared my face up REALLY nicely. I get a pimple now and again every like 3-5 months (stress pimples, I'm currently 23) but they're not too bad. Comparatively my skin looks great - just don't fuck around with it and follow the rules.