I've been secretly struggling with a marijuana addiction for 21 months and none of my family or loved ones are aware of how bad it is.
That's a tough secret. Do you think that your family will love you less if they knew that you are addicted to marijuana?
I hate them anyway. When they find out that I've resorted to crime, I will just hate them even more for lacking faith in me
You are using illegal drugs and you need to go to drug rehabilitation. You also need to be more honest with your family and give them a chance to help you and support you. If you do not get help the drug use will lead to harder drugs.
I don't need to tell them. I will stop using
I really think you still should tell them about this, since it was such a huge part of your life, bad or not. I'm sure they would applaud your honesty for finally going forward, and they would be proud you want to try to stop. They will definitely want to help you!