Don't sweat it bro. I'm a freshman in high school and when a group of my friends get to talking all at once, it's amazing the differences in their voices. Or we'll be playing video games and a dude that has this kinda deep voice will get surprised or scared in the game and screech like a little girl. I started getting pubes and stuff at around 11, but my voice didn't start to change till I was 13. And I didn't have a growth spurt really until last summer.
You can research a whole lot of this stuff on line. If you Google puberty you'll have enough stuff to read for days. And of course TH is here to help answer stuff too.
And like Acheron says... dudes in your age group making fun of another dude's voice. F****CCCKKKKK EM!
Peace...
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EDIT... By the way, if you can sing... don't be in a hurry to get rid of the high voice. Could be worth millions