Hi Kate Glad I could be of some help.....Anytime you want any info or help just PM me...I will do my best to help you.
I checked out your vid.....I like the song and the performance.....you need to stand closer to the mic....it was too distant and faint sounding.....was this recorded with a vid camera using the built in mic? or did you record the sound seperate and add it to the vid?

I have shot a vid of myself and my pals in the studio.....we used a cam corder and the inbuilt mic provided the sound....for comparison we recorded the audio live and at the same time and I have posted this audio for folks entertainment and as a comparison.
It is on this forum titled Big Jim in studio vid.