I am having issues subsurf-ing my object, part of it is deformed This is my object:


As you can see, the right side has a weird protrusion, and where the project meets the mirror, it seems to kind of go up rather than remain flat.
Which version of blender are you using?  I downloaded your blend file to 2.78c, and it does not show the problem.  Having just finished that tutorial myself, as far as I can tell, your mesh is correct.