This one is actually my biggest fear. Because I have anxiety and OCD, I figure I'm more "susceptible" to mental disorders. The thing that I try to remind myself of is that a.) if I look at it honestly, I don't have the symptoms that correspond with those disorders, b.) these conditions are fairly uncommon, and I've already "beaten the odds" once by having the bad luck to be born with OCD and anxiety, and c.) worst case scenario: if I do
end up with any of the disorders I fear, I've got some great resources at my disposal, and plenty of people have bipolar, borderline personality disorder, multiple personality disorder, even schizophrenia, in some cases, and they lead perfectly healthy, "normal" lives. It's definitely not easy, it takes work, and there are probably times they want to just say the heck with it and give up, but they cope. And as people who are constantly battling with our own thoughts and emotion, we've trained ourselves to handle whatever our brains want to throw at us. This coping we've already been doing has made us stronger.
I think one of the best things we can do for things we fear is not to look at the situation and say, "that'll never happen," but rather to say, "if it happens, I can handle it."
(Don't get me wrong, next week I'll probably be in here freaking out because I'm utterly convinced I've got X disorder. Then maybe you'll need to talk me down.