Since some anons mentioned Smash Bros, I was reminded of what happened to me playing Brawl's adventure mode as a youngling. Near the end you end up in a new map made of a jumble of earlier areas. The save rooms show you a map of this whole setup, and mark your location. But for some reason my retarded kid self couldn't read the map. It's easy to read, and when I came back to the game a few years later I had no trouble. It's a bunch of squares in the shape of the rooms with lines showing the doors leading between them, the interpretation is very obvious. Felt very stupid after I figured it out.
One of you mentioned that you only started to enjoy Smash after being old enough to be good at games, but I had the opposite experience. It was fun with friends when we were all kids and we all sucked, but when we got old enough to be good at games it wasn't fun anymore for me.
My other retard experience was playing Metro: Last Light. There's a sort of boss fight against a bear near the end of the game, and you have to stun it, then shoot it in the back. Now I knew this, the game tells you very directly. But for some reason it just wouldn't die. I emptied all the ammo from my sniper, my AK, and my shotgun into its back, used all my grenades and throwing knives, then ran away and poked it in the face with my knife until I ran out of filters and suffocated. Took over an hour. Didn't work, so I did it all over again. At that point I figured I was doing something wrong, so I watched a YT clip to see how to so the fight, and I was aiming slightly too low the entire time. I felt very stupid. Especially since I was doing it on purpose to avoid hitting an ally that grapples the bear to let you get a shot.