Is it normal for guys to wear little girl panties?

No. Are you a crazy nob cheese?

Okay, if it was common, you would know that. If you meant is it alright, consider that a popular style for women right now is "boy briefs." Women are also wearing boxers.

Guys are big into boxers right now, and boxer-briefs too. Even guys briefs are fine but can get you teased. If you like panties because of the fit, know that guys briefs are not all cut or fit the same. They come in colors and sometimes in cotton-polyester. If you get to men's sizes, they also sell "fashion briefs" which come in different versions, which might fit and feel enough like panties that you could be comfortable in something marketed for men.

If you wear panties, be very discreet. If found out, you will get teased, might get a "reputation," and could get beat up. Other than that, I suppose there is nothing wrong with it.

If you can find a guys style and brand of underwear that you are comfortable in, all the better. If you feel you must wear panties daily, get white ones so if they show a little, you are "covered!" It's not wrong, but other people will call you weird.