I'm sure this has been suggested on here before but you should record yourself. I'm sure audio and video would be even better but if you have an iphone just turn on your recording and let it roll while you're out with people.

For instance I have a baritone voice so I usually just assume I always sound powerful and subconsciously fear i'm james earl jonesing it. But I noticed I would speak quieter when I would agree with something or say "okay, yeah, alright" too much after people made points. And as has been said on here many times being easily agreeable (while not necessarily out of weakness or a beta-ness), it can make you come off as far less attractive and powerful to people.

This is the kind of stuff that takes real work if your natural inclinations run counter to how you want to come across. But it's just a suggestion to try out. Do you sound like what you want? Because you can. And what you sound like could be saying something about you you may not even be aware of.