TTC and out of ideas READ PLEASE!!!:(

So me and my fiance have TTC since March and we have not gotten pregnant yet. Come to find out bc he didn't know how to tell me this but every time it came about us wanting a baby he would always say " I scared I can't get you pregnant and then your going to leave me" well the truth came the other day :( I'm not leaving bc he can't but I want to something else but don't know the next step, I do have my first from my previous relationship and obviously he don't he treats her like his own. But we want more kids but I want it to be of the both of not some else's sperm :-/ I'm out of ideas here lady please help me