Common places for birth control...?

kayla
I just turned 16 at the moment and I am thinking of using the pill. I wanted to know where I could get birth control easily and at little to no cost as possible. 
If I tell my doctor I'm sexually active, how will that affect things? Will they prescribe birth control and not inform my parents? 
Also, I heard birth control can lessen your sex drive and natural lubrication. Are those true?