Thanks for all the great advice guys. I'll try barring first, and then see about switching keys. I don't mind that it's a difficult song -- I'm the jump right in there type, and will bore easily if the music I try to learn doesn't get progressively more complicated.
Actually, I'm an expert at singing loud! I think the recording just didn't pick up my voice very well because I am sitting rather far from the webcam, and looking down (I'm trying to get away from the habit of staring at my fingers while I play). I'll sit closer next time.I like your singing but you need to belt it out, breathing with your stomach helps you to project your voice more. I'm not trying to be critica, I just want to HEAR you!