Ready to give up on trying to conceive?

for two years ive been trying to get pregnant. it seems like no use. ive been on birth control on and off for dysfunctional uterin bleeding for two yrs. i used the birth control to fix my hormone levels. get them back up where they need to be. but they seem to do no good. i have gone to my obgyn about 100 times and she always told me everything looks fine and i shouldnt have any problem getting pregnant but i obviously do. ive seen about 4 different obgyns. i cry all the time because i feel like me and my future husband will never have a family of our own. i feel terrible. :'(