Your story shows an incredible amount of resilience, creativity and persistence. If you're a teen mom, taking a job as a live-in nanny is a very adaptive decision -- one that it positive, logical, and innovative. (And one that many teen mothers seem oddly reluctant to make.) One that moves you forward instead of holding you back. Decisions like that SHOW (not tell) that you will find a way around the obstacles that life will invariably throw in your path, and that you have your priorities straight.
Also consider how this makes you so much more 'relatable' to the large portion of our population not born into a stable middle-class environment (AdComs will consider that), and how your story can be an inspiration for others.