Don't "force" your voice.
It'll do two things;
Damage your vocal chords, and make you sound comical.
Neither of which is useful.
You can train your voice downwards a little bit, but not a lot.
You can also learn to speak from your chest a bit more and "boom" your voice a little, that helps.
There is more to "voice" than actual tone. There is also speech patterns, word usage, melody and bodylanguage (hand gestures and the like) that are key to passing during "direct" communication.
These things you can study by watching other guys, which can be creepy in person, but if you "study" men in youtube vids (run Jay Leno through it and you can watch a lot of interviews, mano a mano, to study) or movies or just on the news, then you can get a "grasp" on it.