I love singer justin biber.  He is very good singer.
You like singing! When you sign, sound travels at about 75 miles per hour. 
No.  I was singing normal songs.
The oldest record of singing trace back to about 2600 BC in Sumeria.
I know.  But,  Justin bieber is very good singer.
If you are singing, you should avoid eating or drinking carbonated drinks before and during the performance. Eating can make you regurgitate!
Yah.  I am absolutely avoid eating and drinking.
Do you have a vocal teacher? Most of these folks can't even sing themselves!
Yes.  I have vocal teacher.
Singing requires your muscles and like every muscles in your body, it can be trained, grow, and get stronger.