I remember when a well meaning hairdresser decided to give me a pixie cut... which I agreed to because I wanted to try it short. Apparently, I cannot pass if my forehead is exposed too much, and the shortness emphasised that from the side, I have a huge head in proportion to my neck. Basically, I looked like an anime character and more female than when I had shoulder length hair.
Now I have my hair collar length in the back, just a bit shorter than halfway up my ears, and eyebrow length bangs. This is the best passing length for me - I might go a bit shorter, but not much. Besides, I have mad cowlicks that make my hair spike naturally at multiple places when it's too short. So... yeah, sorry to hear about the bad cut.