The Magpies have lost six league games on the bounce and are just one point above the fourth tier's relegation zone ahead of hosting Doncaster Rovers on Boxing Day.
Sheridan admits he expected to be in the promotion hunt when he arrived at Meadow Lane in the summer, but is prepared to stay strong as Notts battle to turn their fortunes around.
"I was confident I'd get us in the play-offs," Sheridan, who is currently serving a five-match touchline ban, told the Nottingham Post.
"I signed a three-year contract; I didn't expect everything to go really well for me in a matter of a few months.
"But I didn't think it'd be going this way. I was positive we'd be at the other end, where we were only four or five weeks ago.
"I don't think I'm a bad manager all of a sudden, but there's something not right. It might be the way I pick my team or the way we play.
"I've got to stay strong. And I will be strong. I won't be hiding.
"I'll accept the criticism. I'll accept we're having poor results. I'll accept the uncertainty going on around the place. But I'll be strong, I won't hide.
"I'll be right at the front. Unfortunately I'm sat in the bloomin stands at the moment, and that's not where I want to be, but I'll still be trying to get the best out of my players.
"I haven't got a magic wand. We're in a sticky position. I've got to stick to my beliefs. I'm confident I'll get us out of where we are."
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