You won't lose your sanity or rationality under any circumstances unless you're being controlled by a power. And even if you somehow did, no matter the circumstances, you will never lose your humanity and empathy. Your team, family, or friends will always be there to bring you back from the abyss. Your personal issues are much easier to work through and even without help you'll be able to get through them in time. This might take a while if it's bad, but you'll make it out eventually.
This also makes you highly resistant to mental health problems and emotional manipulation, though not completely immune. You’re also really good at helping others through their issues, and it’ll stick more often than not as long as you can get through to them.