Plenty of women have tried for years and get BFPs...
In my case - we tried 3 years on our own and then 2 years with three different REs (long story) and got a BFP on a IVF cycle.
I know a woman who tried for 17 years and then got a BFP on Clomid. I don't know her FSH history, though, and she did have a multitude of other issues.
Just because you didn't get a BFP all along doesn't mean you'll never get a BFP. Maybe IVF is the magic bullet??