How Can you go from singing Choral music to music such as pop or Country?

Im singing Carrie Underwood’s "Cowboy Cassanova" For my schools talent show but it seems weird singing like carrie and not trying to match pitches.
Then i cant seem to get up in my voice without going into my soprano voice.

ok i have been in your shoes more than once if this song is a good match for u then great but what u need to do i close your eyes relax and find this song in yourself make it your own to suit u and your style conform the style to u or sing it accapella then its all in your style