1. Anyone can sing any style, if you learn abit about the techniques a certain style often involves. You talk about lack of power and brightness. If this is something you wish to be able to do then I recommend you start looking into twang. Twang will increase your volume and make your vocals abit sharper.
Go here(http://vocalcoach.dk/uk/onlinecourse/) and do the following:
1. Scroll down the page and click the button neutral with soft closure.
This is the technique you are doing mostly. It is soft, airy and always has low volume.
2. Now click compressed neutral.
This is abit stronger and sharper. But still very similiar. The easiest way to find this would be by simply adding abit twang. Try singing with a smile. Also, just as a picture in your head, try to sing with a with a more compressed sound. If a regular smile doesn't get rid of the air you could always do the joker smile http://upload.wikimedia.org/wikipedia/en/f/f9/Manwholaughs.jpg then you should really get to feel what alot of twang feels like. And singing like that can sound very piercing and sharp. The key then is to feel how much twang do you need for certain notes to get the sound you want.
Now I don't want to overwhelm you with new techniques, so I recommend you try this first and then if you wanna wake the neighbours you should push the button overdrive on that page and I'll give you some tips on that.
2. Do what you feel like, I believed a year ago that you had to be a natural talent to be a great singer and that I was born with a certain voice type, and that I only could sing loudly(Yes I could almost only sing in overdrive, too much metallica in high school did that to me.). It was all lies. Some people has to work harder than others to be learn to sing certain things though, but that's life.