you are in the minority, 70% of women get nothing from penetration, the g spot is a dubious disproved theory at best, try reading something other than cosmo,
Also i think you will find that exploration into the mechanics of female sexuality are quite limited, myths in this area are quite pervasive. And because a female orgasm doesn't have much to do with reproduction science hasn't been too interested, as such there is alot of erroneous info around