I started shaving in 8th grade, and I feel much better for it. I feel more feminine, smooth, clean and sexy being completely hairless between my legs.
Being hairy is for men.
I stopped shaving though, now I wax, or sometimes use Veet. If you shave you can get those red bumps which are bad to shave off - ingrown hairs. But if you do plan on just shaving, use a good razor, soak well to soften the hair in warm warm water, and use a good cream. Shave moving the blade in the same direction the hair grows - you might notice that above the cli toris the hair grows downward, and directly between your legs on the labia it grows towards the center. Spread your legs wide, and don't be afraid to pull your skin to make it easier to shave. there will be less chance of getting those red bumps if you don't stroke the same area more than a couple times with the razor.
Some girls with finer hair use an electric razor, but that always gave me stubble in like a DAY, which itches too much.
If you are shaving some, you might as well take it all off - some girls leave the landing strip, but I don't really see the point in that except to prove they have enough hormones to make it grow in thick. Silly, but that's fashion. Fewer girls are leaving any on these days, since it's hard to make it look right, straight edges, hair pointing in the right direction, etc. Why bother. I leave hair styling for my head - seems silly to try it between my legs.
After shaving, use a good after splash with NO ALCOHOL in it, that stuff burrrrrnnnns eeeeyouwwieee. Waxing hurts less than that. Trust me, I know what I'm talking about!
Waxing has the really great advantage of the hair stops growing in so thick and heavy, so the more you do it, the less it grows back. With some girls it stops completely. I have less than half what I used to have, it's GREAT.
As for nature putting it there for a reason? Yeah, it's true. The reason was to make you SMELL. The hair traps and concentrates odors produced by your body, and in primitive humans the smell a woman had could tell you how healthy or fertile she was.