Why VR pawn passing through objects

I am working on a VR project, using HTC Vive. My issue is that my default VR pawn is passing trough all the meshes in my environment. I did added collision capsule to the pawn but it still is passing through. The only time it actually doesn’t pass through is when I check physics check box of the other meshes. But in this case my pawn collides but the mesh with which it is colliding moves away on collision and that is not what I want. I just want that my pawn just pass through meshes , such like walls, box, etc.

Any idea just what am I missing here?

Might be Collision issue. You Can how to add colision on google easily.