I think the context of a therapeutic relationship or helping relationship - even informal - is totally different than a grad school application. In a helping relationship 'self-disclosure' is an entirely different issue due to the power dynamics at play and the necesssarily "one-way" focus of the relationship. These things aren't relevant for an application, though other concerns may be valid (concerns about professionalism, etc.)
I'm sure this is the approach you've taken, but if you are including this in your statement then I would suggest focussing not just on what experiences you have had, but what you've learned from it and where you are now. Experience with oppression/trauma/personal struggle alone doesn't automatically translate into skills or perspectives that would make you an effective social worker, but it can if you have grown because of it.
Best of luck with your statement