Camera shows my character

I couldn't find a solution to this, my character and camera are stacking

 

What is your desired result? Don't show the player at all? Just set up the camera's culling mask to not include the layer your player is on.

 

thanks to your answer I solved it

 

This is completely normal behavior. It's called backface culling, and it's the most common graphics optimization used by video cards and the like.

Every face has a 'normal' value, which defines the vector pointing directly out from that face. As well as being used in several shader calculations (lighting etc.), it is also used by the camera to determine whether the face in question is on the side of the object which should be visible. If not, (ie. the normal is facing away from the camera) it simply does not render the face.

There are two solutions to this problem- the first is to find or modify a shader that doesn't remove backfaces. This is probably not the best of plans, since it will probably double the amount of rendering that needs to be done, for no real advantage.

The second option, which I would recommend, is that you model all your meshes to have two sides- one set of faces for the outside shell, and another set of faces pointing the other way for the inside. Another thing- for UV mapping, you probably want a different texture on the inside. If you only have one set of faces, you'll have the same texture on both sides- which would look a little odd, for most buildings.