Is it possible to be insecure and overconfident at the same time?

About two different things yes. You can't feel the same towards everything, and at the same time.

If you asked me to do something related to acting I could do it with ease because it's one of my fields of specialty, I can have confidence in that.

If you asked me to do math then I would get very insecure because I lack knowledge

Sure. A man recently told me about his conflicting feelings. He is a great speaker, recognized for his ability to move an audience. As such, he says that he borders on overconfidence. Conversely, when he is in a social situation, having to interface one-on-one with another person, he becomes terribly insecure.

It sounds just like me depending on the day and the mood. I meant some days insecure and some days overconfident. Not usually both at the same time.

Yes, the overconfidence is just a front to hide the insecurities.

I feel like histrionic personality disorder kind of includes that

Insecure but arrogant

It's a façade

I guess. interesting q

Absolutely.

I have been.

No idea

Yup

A fake overconfidence, yes. Those who overcompensate for what they're lacking by going over the top. Like the guys who have a small penis, so buy a really loud, big and noisy car.