There is only one "something" to be hit: Your cervix.

Some positions work for some and not for others; it depends upon the geometry of the two bodies involved. Most of us need adjustments to make any position work. Take some time and practice without a frantic rush to (his) orgasm.

Read the sticky post entitled The Four Hotspots.

He has got to learn one crucial skill: how to tell where he is in relation to you when he's inside of you. You should be willing to tell him, help him learn by talking him trough his exploration and showing good/bad/ hot/cold both by your reactions and with words. If it hurts - it hurts so SAY so. If its not working for you, then Say that and suggest something else or move around a bit so it does work for you.

We all really learn something by doing it.
Practice makes perfect!

I like to friend position it is very pleasing and comfortable for me

book,

See my post above. Nothing else to be said.

I recently slept with my gf for the first time, and we did it missionary position. Problem is that i kept hitting something hard with my penis. Could this be her cervix? Any tips on how to avoid hitting it?