You sound nervous and completely static. Sing with confidence and dynamics. Let the quiet parts be quiet, but when it builds, sing loudly.
The way the original singer does it is to have fluctuating dynamics within phrases to accent lines through most of the song, with a slight build throughout peaking at the bridge, then fully soft on the down chorus, and loud again at the end chorus, but soft on the last line.
You need to practice singing more and get better control of your pitch, breath, vibrato, etc., but even just more dynamic control would make a substantial difference.