How to sing this with a normal voice?

I never had a singing class. I was never interstedd in singing.

When I sing this I sing the notes correctly in the right key. But I can't sing it in what you call in key. How do I sing it with my normal voice? Don't tell me get a teacher.

https://youtu.be/-6SKMIJA_ys
Update: wrong link
https://youtu.be/-6SKMIJA_ys
Update 2: wrong link again
https://www.youtube.com/watch?v=-6SKMlJA_ys&feature=youtu.be
7 answers 7