Do I have to inform the girl that I am planning to marry about my infertility problems when it is likely that will be a deal breaker? In that case, what can I do?
Sorry to hear about your situation.
I just wanted to add that even in this day and age when we think we control everything with technology, life and death are still in the hands of Allah. I have known several men and women who thought they were infertile (or even had surgery to prevent children) who later had children. Similarly, some people who are fertile never have children.
So unless there is an obvious genetic or anatomical reason why it is wholly impossible for you to father children, sometimes the possibility exists.
Of course you know your situation best, and perhaps it is not relevant to your specific situation. I just thought I would put it out there in general - there are no guarantees - although sometimes we can get a good idea of the probability of something happening, and it makes sense for someone who has a strong interest in having children to maximize the probability of it happening.