I am a xplane user but i am trying to get used to fsx as well but i can't get used to looking around while using spacebar. Plase help me guys i am really trying to use fsx and that would help me a lot

All you need to do is map the mouselook key to the right mouse button and it will work.

 

However, that is probably not a good idea if you want to use VC controls, because some of them require the right mouse button.

 

It would be better to map it to either the middle mouse button or mouse button 4 or 5 if your mouse has extra buttons on the side.