Here is some information from MedHelp.org on how Hep C is diagnosed. Read it and get the proper tests you need to confirm that you have HCV.
http://www.medhelp.org/hepatitis-c/articles/Diagnosing-Hepatitis-C/2273
If you do get a confirmed diagnosis, the below article includes some next steps. Please come back to the site and let the community here know how you’re doing!
http://www.medhelp.org/hepatitis-c/articles/Just-Diagnosed-with-Hepatitis-C-Heres-Whats-Next/2254
Sandi is right, hep c moves very slowly so in addition to your youth you have caught it very early. It is not a death sentence, there is a lot of help. We will help you as much as we can. Easier said than done, try not to worry. Keep in touch. Dee
Congratulations on stopping the heroin
First you need to verify that you actually have HCV, some people are able to clear it.
You are young so you have that going for you.
I'm sure you are afraid, we were all afraid when we were first diagnosed.
How do you know you got it a year ago?
If so you are very lucky, most don't know they have it for many many years. I did not know I had it until 30 years had passed. I was checked at 20 years post exposure, and got a false negative.
So, you need to get your viral load checked and your genotype to see what treatment you need to do.
There is a lot of help on here. I'm sure others will be along soon to help.
Good luck
Dee