Does this mean that your fantasy character knows everything you do in RL?
Oddly enough, as much as I avoid metagaming as a general rule, I actually have one character that does know everything I know.
Many years ago one of the DM's I play with wanted us all to experience his father's DMing. He talked his dad up and told us how hard his dad's game was to survive in without a lot of skill and how good of a DM he was.
One day his father who had long since retired from DMing decided to run a game for my friend's birthday. We all showed up and made characters. I made a thief and decided on true neutral for alignment. I was given an NPC henchman who coincidentally was also a true neutral thief. My friend, though, had a special character. His father's story involved my friend himself being pulled into his dad's world at the same time as some anti-version of him was also drawn into the world. The prize for the player who did the best in the game was to have that character transported across the planes into my friend's game to be played there.
With the two of them in the same universe, what held his dad's universe together started to unravel. It was our quest to find the anti version of him and get both of them to leave our universe. We had to get them to a ziggurat and have them walk to the top where they would be moved back to where they came from.
During the trek we had to walk over a narrow beam that was above a magical pool. Some of us fell in and both I and my henchmen missed our saving throws and turned into a frog. Also turned into a frog was my buddy. Long story short, we made it to the ziggurat as frogs and people. At the top was a floating ring of mithril with a bowl underneath it. The cavern was caving in because the universe was ending soon. We learned that you had to be in perfect balance to ascend to the top or all was lost. My friend and the anti-version of him began walking up and I suddenly had the thought that since there were 4 ways up, we would need four people to ascend at the same time, so I had my henchman hop up one side and I hopped up the other.
As it turns out, the only thing that saved the universe from destruction was that both my henchman and I had true neutral alignments, so the balance was kept. Otherwise what I did would have doomed the world. Once we all got to the top my buddy and his anti version disappeared back to their universes and I was sitting there at the top at a loss for what to do. When my friend's dad asked me what I wanted to do, I told him that I hop into the bowl under the ring.
What none of us players knew was that the ring above the bowl powered all magic in his dad's universe, including the gods, and when I jumped into the bowl I got sucked inside of it, becoming the controlling consciousness behind everything. In short I turned into something like Ao of the Forgotten Realms. The first thing I did was looking into our real universe and see if my friend was still a frog. He was, so I turned him back human again. I also asked to learn more about my friend. The second thing I did was turn all of the rest of the frogs back. The third thing I did was look at the anti version, which was a mistake because of how the two universes clash. I missed a critical roll and got ejected from the ring and was dying. The group managed to save my life after my henchman dragged me back down the ziggurat and the game ended.
The group voted me as the one who did the best, because became a god seemed to be better than what the rest of them did.

My character was duly transported into my friend's game, but he had knowledge of my friend and further, knew his history including about the game of D&D itself and players. It was decided that since he was aware of that and of both the DM and myself, that he would share knowledge through that connection. His alignment remained true neutral, because when you are aware that the entire multiverse you roam around doesn't really exist outside of the DM and players, law/chaos/good/evil become meaningless to you, because nothing you do truly matters. All outcomes are also pretend. Nobody really dies. Nobody really comes back to life. It's also very depressing for the PC, because you know you aren't real and don't really matter.
Outside of that one very unusual circumstance, I maintain a no metagaming stance as both a player and as a DM.