I've lost everything because of my drug use.
That sounds very difficult. Are you still using drugs?
Yes. I can't help myself.
As you found out, using drugs can destroy your life and cause you to lose things important to you. There are ways to fix this though. You should go to rehab since they will be able to help you there.
I don't see why I should go to rehab.
You said that your drug use caused you to lose everything. If you go to rehab and seek help, then you can start rebuilding your life by getting over your addiction. Think about how much better your life will be in a couple months if you are able to stop using drugs and start over as a sober person.