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guess what
non-toxic positivity means you have to talk about negative things to empower you into acting towards recovery
it also means never talking about negative things is toxic because it only hides wounds that will worsen if not taken care of
talking about what's wrong in your life is taking care about yourself and therefore everyone else around you and especially your loved ones
take care of yourself 
also, there's balance to find between finding positive in things where you can't see any without effort, and reflecting on the negative
i'm not saying you must talk about everything to everyone though, just don't prevent yourself to do so if you want to