Hi,
I'm the same age as you, I started Roaccutane in September 2012, I have just one pimple on my face.
I used to have crazy oily skin, after washing and moisturising I would get oily within 15 mins. It was awful and a few people comented the oilyness and the pimple's, which were big and deep cysts to small pimples that covered nearly all of my face! I always felt self conscious and carried tissues and paper in my bag to blot, I found that paper was better at sucking up the oil! How crazy is that, that you find weird things to stop the oil for a short amount of time? It always came back. 
I have been on Roaccutane for 5 months now, at a dose of 40mg once a day. It has done wonders for my skin (smaller pores, nearly no oil production & just one pimple) and self esteem. I'm a lot more confident in myself and I dont touch or pick at skin any more, which has obviously stopped the spread of pimples.
I have a blog on here, check it out, I haven't been very good recently with updating. But you'll be able to read about my personal experiences.
I hope it helps, if you are serious about wanting better skin then you should stop reading negative posts (thats what I did) and use only your own experience to guide you, you'll also be under the care of a dermatologist, so can go to them for guidance. We are all different and medications work in different ways for all of us. I take a 8ooui dose of vitamin E before I take my Roaccutane, it's supposed to help as Roaccutane is fat soluble. I've had to get over the dry lip issue, headaches, and probably many more side affects as I'm thinking long term. I have spent well over 15 years of my life suffering with acne.
I feel a have a lot more head space for life now that I don't worry about my skin all the time. I feel good right now, I don't know about the long term effects but I'm drinking more water than before and taking better care of myself (eating better).
Good luck with whatever you decide. 
Edited by pr1nc355, 10 February 2013 - 05:02 PM.