I’m surprised this one isn’t up there yet.
I cannot sing.
I know the reason why, as well, so I can shut up people who tell me I could if i tried, or “had the right teacher” or whatever.
My voice is pitched lower through bone conduction in my head, by about 1 & 1/2 steps, than it is pitched through air conduction, and therefore, the way it sounds to anyone else. So, if I hear a pitch on a pitchpipe, and match my voice to it-- at least, the way it sounds to me-- it’s off by a step and a half to everyone else, and that’s pretty terrible sounding.
Yes, I suppose I could learn to sing everything so it sounded 1 & 1/2 steps off to me, and would therefore sound right to everyone else, but I have no interest in doing so.
The only singing in public I ever do is chanting Torah, and that is just my voice, which doesn’t have to match anything, so it can be in literally any key-- it can even jump around and change keys, and for some people, it does. No one cares.