TTC baby #1 for NINE months

Magdala
Since March me and my fiancé have been trying relentlessly to get pregnant. He is 22 and I am 24, trying for our first kid. I've never been pregnant and just want to be a mother so bad. 
In the nine months I've had one or two scares where AF was real late and I was 15 DPO. Even bought a pregnancy test two months ago and thought I had a faint positive...
I even visited doctors and spent money on copay hoping for an answer. But nothing, just "keep trying" advise is all I get. It's starting to get to me and I know most experts say most couples in their 20's get pregnant in 6 months to a year. We are reaching a year and I'm feeling myself just give up every month. 
I lowkey feel like a failure to my fiancé. He wants a kid so bad and I just can't give him what he wants. I've heard couples being infertile for years then get pregnant but idk if I can handle that.. I've tried to tell myself it's in gods hands and not to rush it. I can't talk to my fiancé about my feelings he won't understand he says it will happen but I'm just not sure..