TTC now on Cycle 10

Me and my fiancé have been trying to conceive since October of 2014. I've been to my OBGYN on numerous occasions who say that with me being young that they expect out timing is just off. My fiancé hasn't been tested because I don't want it to turn into a blame game. We're getting married on the 25th of this month. I've tried everything from ovulation tests, to taking my temperature, and checking my cervical mucas. I'm just beginning to get really discouraged considering everyone around me seems to be having children who weren't even planning on it. By the way, I'm 18, I know I'm young but I'm positive on what I want. I'm posting for support, not judgement.