Answer:
The 3D you are talking about is not actually "3D". It only means there is an aspect of depth in the game. You are still VIEWING the game in 2D. Unless of course you are VIEWING a 3D 3D game in 3D. As opposed to VIEWING a 3D 2D game in 3D or VIEWING a 2D 3D game in 2D or VIEWING a 2D 2D game in 2D. Get it?
To the "Asker" If you actually meant "Can you be in 3D?".You can buy a 3D digital camera/camcorder and VIEW yourself on a 3D TV. Rather than VIEWING yourself in 3D while looking into a mirror.
--------------------------------------------
Yes, If you believe that people can be addicted to video games.
Since those that are addicted to drugs are considered "on drugs", and Since most games are now 3D (three dimensional) it should be quite possible to be "on 3D"...
Used in a sentence:
Ray is addicted to video games, and rarely does his chores while he is on 3D.
Also Yes, If you are a fourth dimensional being.
Since we are 3 dimensional (3D) beings, and we routinely stand on 2D objects (such as floors) it should be quite possible for 4D beings to be "on 3D" given that you have expressed the three dimensional world as a single 3D plane in fourth dimensional hyper space.