Can't see players' skins.

Every time I play Minecraft, I can't see my skin or the skins of other players.

I always see them either as a Steve skin or an Alex skin. I've tried to reinstall the game multiple times, but the same thing always happens.

I don't know if it was something that I did somehow, or not. I have searched online for this problem, but I haven't found anyone with the same problem or with a solution for it.