I don't think that's entirely true. I'm soft spoken also but I always have my head held high, and when I'm approaching someone, i never rest my head or drop it low, doesnt matter if theyre bigger than me. My stance is always firm and straight. People take note of things like this believe it or not. Im not even a big guy at 6ft and a whopping weight of 145lbs. I can also fight and will fight even if I get my teeth knocked out because thats how I am. It's ok to be soft spoken, just make sure you're good with eye contact, firm grip shake, stand tall and look forward.