Hey there. Welcome:)
In your last line you say you want help in managing this. Which this are you referring to: wd symptoms or your addiction?
I'm sorry to have to tell you this but you already know you are an addict. Addicts steal drugs from others. And addicts need help. We cannot kick our addictions by ourselves. If we could, we would.
Since you are so young and live w/ your rents, you need to tell them. I'm sure they want to help you. Guess what happens if you try to keep this a secret?
This isn't just a matter of getting off Ambien. You need to get help as to what's going on in your brain. You won't get better if you just stop Ambien. It's way bigger than that. All of us addicts have issues that we haven't addressed and we use drugs to blot them out.
In any case, tell your parents. You may need inpatient, but definitely counseling/meetings etc. You need help, my friend.
Keep posting and stick around. Lots of helpful folks on here.