Perhaps it will help if you add your PC muscle in the penetration process.

After you develop orgasms with your clitoris, you can play around with all those esoteric spots inside the vagina.

There isn't a "spot" in your vagina that will bring you to orgasm. Your clitoral system is complex. It's about clitoral stimulation with vaginal penetration.

Unless you are seriously bearing down at the moment of orgasm, you will not shit, pee or fart.