If those are weak sides then I must have no sides at all! Seriously though I don't think you have weak sides, it's perfectly normal for the cheeks to be less dense than the rest but if you give it  a few months to grow it will look a lot fuller. I think you should reach the 3 month mark before you start thinking about trimming it, if you feel the need to trim before you reach 3 months then it's ok to do that.

You are totally right about the mental journey, it's crazy how some guys can obsess about "flaws" in their beards that nobody else can even see or notice. But it's natural to be nitpicky with your own beard, I mean it's growing on your face after all!