Angela White -- formerly known as Blac Chyna -- is nearly three years sober and living a whole new life, and she's spilling on how it's transformed her world, from motherhood to career moves ... all with a new movie out soon!

We caught up with Angela Thursday on "TMZ Live" ... where she laid it all out -- crediting her baptism and faith for sparking self-reflection and healing -- and revealing her new 30-day challenge to inspire others on the same path. Gallery Launch Gallery Getty

Check out the full video -- Angela said her problem was binge drinking, not "everyday" boozing, but she says it's a form of alcoholism, nonetheless ... and one many people don't realize exists.

Now, Angela tells us she's nothing like the woman you saw in her old, alcohol-fueled reality show clips

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