Bleezy. I'm so sorry that it had to happen the way that it did. I understand that not only are you dealing with, or dealt with in the past, going through the justice system which in and of itself is... meh... with drugs.
your family is dissapointed and, like you said, SHOCKED. Put yourself in their shoes. Your family WILL return to you. You are going to have to go through the bullshit that comes with drug convictions. You're going to have to go through a lot of tough stuff man, I can't deny that. Making it through these things SUCCESSFULLY, with a POSITIVE mind, and a mindset that you will CHANGE your life and focus all of that time on bettering your life... that's the stuff you need to focus on.
Focus on yourself. Lean on your mother and sister, express that you made a mistake. Express that, if you truly believe and want this, that you will never do anything like it again. The rest of your family will come back around. They love you, they just don't know what to do at this point. I dealt with the same thing with my family when I came clean on my pill addiction the 1st, 2nd, and now 3rd time. We all make mistakes, but family is family. They love you, and while I can't promise they will speak to you again soon, I am very confident that things will return to normal and things will be in the past if you can stay strong and show them that you know you messed up.
Prove to YOURSELF firstly that you want to change and will, regardless of what legal stuff you have to battle with. Next, prove to your FAMILY that you truly do love them. When things like this happen, those that love you and have been around you can feel partially at blame. We're here to help. Please continue to post. We'll help as much as you can.
With love and support,
TTGB