You're not a fraud. Just because you've found a place where you're fine doesn't mean you're not ill. It just means you've found remission with your meds and that is a good thing!
I am also really good at hiding my feelings. I guess you could say I was "trained" to do that, because of how I was raised. I go along without meds and I seem okay to other people until the messiness of what's happening to me overwhelms me, and then everyone is confused. They don't understand that I actually need help, and because I can't ever seem to get help... well, messiness happens...