you my friend are not a failure...just an adict caught in the grips of addiction. either of those options would be great. some here have gone to rehab other have done it at home...have you ever thought of suboxone? it maybe an option for you. i myself have never taken it but many here have and it worked for them. it is a tool for helping you get clean. you still have to deal with the issues that cause you to use. it can be done though. you just have to do your homework and find the right option for you. keep reading and posting it will help you.
much luck on your journey
cathy
First, relapse is a part of recovery. You only fail if you don't try again. My opinion is you should tell your parents. They sound like they were very helpful the first time. I find it hard to believe they won't be again. Plus you will need the support. Your mom sounds like she was great the first time and being a nurse she may find out before you tell her anyway. Plus this is not worth going broke over.
Good luck and let us know what you do.
Melissa
it sounds to me like u need a rehab that teaches you how to avoid this in the future. Have you ever heard of Teen Challenge? it is a Bible based resident program that teaches you how to avoid falling into this again and how to live your life productively. it teaches helping others, contributing to society, etc. has a very high cure rate.
Lucy
You are not a failure. You have to find the right plan for you to stop. You sound like you really want to do this and this is a great support site. You will find so many great and helpful people. I wish you all the luck in the world.