Don't feel bad, dude: not even scientists can find a woman's "G spot." Because it is a myth!
Scientists did a big huge study on genetically identical twins—not about cancer or anything, but about the 'G spot,' which is also important, in its own way—and found that "identical twins were no more likely to share a G-spot than non-identical twins who share only half of their genes," which in the normal, everyday language you're comfortable with means that highly trained scientists have concluded the G spot is purely a myth, probably one concocted by the liberal media in order to sell more copies of Cosmopolitan.
Men can now safely resume blaming women for female sexual dissatisfaction. Huzzah!