Why can't I get pregnant?

Zoe
I know they say to wait and just not get stressed but I'm so sick of seeing negative pregnancy tests. I had a test two days ago with a ghost line- which disappeared after 45 mins. I've since done another test which was definitely negative. I just want to be a mother- I hear all these new mums tell me they tried and tried and eventually got lucky- but when will it happen for me? Anyone else feel like this... Just helpless and frustrated.