For me, not with bipolar, but I often feel a fake at anorexia. I have anorexia, purging type. I don't even restrict my calories. I purge not by throwing up, but thru overexercise (then don't eat enough on purpose to compensate for the calorie deficit) and of course have all the classic ED thoughts about food & my body. But I feel like a fake at having an ED, especially anorexia, what type of anorexic doesn't try to eat less than 500, 800, at most 1000 cal/day? And I eat way more than that, hence I feel a fake all the time in that regard, so I understand a bit.

The bipolar...no, it really blossomed when I was around 25 (had signs of depression & then bipolar around 18 or 19 years old), but now, too much has happened for me to doubt it. I unfortunately only ever had one stable period (around 6 months long), otherwise I'm depressed, manic, hypomanic, or as right now and probably practically forever, mixed.