Have you seen a doctor? It might be something really simple which the doctors can sort out. Lots of women need fertility drugs to help them conceive for example. I've also been trying for ages and have now been prescribed clomiphene because I have polycycstic ovaries.
Having said that I think the average couple takes a year to conceive (depending on yr age) so no need to worry. Have you seen the ovulation calculator on this site? It can predict you r fertile days for the next year. Might be a helping hand.
i have been tryin for a baby for nine months and nothin my periods have been gettin really heavy and painfull every month i come on i feel like cryin nothin seems to be workin and i have now been using a fertility monitor but still no luck !