If you haven't had any testing done, how can you be so sure you are infertile? I'm sorry that you are feeling so sad, there is nothing worse than thinking you can't have a baby when that is all you want to do. But, I think you might be assuming the worst, and if you go to a dr and have some tests done, you might get a wonderful surprise.
If you and your BF seriously want to have a baby, and you've been trying for some time w/ no results, then you should go to your dr and get a fertility workup. Many times, the issue is treatable, and you can go on to have healthy babies.
Wishing you all the best!!