Hi. I can relate to you. I am 27 and used heroin and various other drugs for many years. You cant expect your parents to understand if they are not addicts, they never will fully 'get it'. Its not something that can be learned or explained, only us who experience it can truly get it. But you can be honest with them, let them know what they say how it makes you feel. You need to establish a support network, if you arent already i strongly suggest AA or NA. People there can relate and understand. You dont ever have to use again, and at your age the rest of your life can end up beautiful and full of happiness, or you could be a miserable junkie or worse, dead before 20. You are at a turning point, make the right decision, and follow through with all your heart. Good luck.