Why does my voice change from day to day?

I have a deep voice which I hate and can barely talk straight. Some days my voice would sound worse than others, it varies from day-to-day. How come?



Usually when I'm nervous I would speak better. But it doesn't always work.Why does my voice change from day to day?
If you're like I think, which is between the ages of say, 12 and 15, it's just a matter of your vocal chords thickening, maturing and you becoming a young man.



The deep voice you hate, will be something you'll learn to love as you get older and see how women respond to it, believe me, I know! lol