Are boots sized properly? Snowboard boots should be smaller than your normal street shoes so that your toes touch the end of the boot. Your feet and snowboard boots are how you steer a snowboard and its very important to have a snug fit with no extra space. Perhaps you could get by with a 10.5 boot. In which case you might be able to ride a board with a 25.0 waist width like your Clash.
Also post another photo from above with the boots strapped in tight. It doesn't need to be a close up. We can give you better advice from a photo taken at head height.
I think unless it is excessively much you should be fine. Overhang always seems to look more than it actually is and doesn't seem to affect riding that much unless you are throwin' down some cray eurocarves and like others have said as a beginner you are prolly as not much on edge as you perceive. I wear size 8.5/9 boots in women's and am lightweight so all the chick boards for my size in the lower 140s have small waist widths. I took a pic of my boots in my board and measured and have 2 inches of overhang front and back. The rise on the baseplate binding (reflex) it gives even more leeway for overhang to be ok. I can only name one time where I caught my foot and sprawled and it was spring slush 60 degree temps where I was charging hard to get speed on a steep to flat area and buried it, otherwise never an issue.