The problem is, that I fail to unambiguously understand this phrase. There are two ways in which I can understand it (and a number of similar phrases):

1. I may never be able to do this = I may not be able to do this at any point of time. ('never' negates 'may')
2. I may never be able to do this = It's possible that I will never be able to do this. ('never' negates 'be able')

Which is the correct one?

The problem is, that I fail to unambiguously understand this phrase. There are two ways in which I can understand it (and a number of similar phrases):

1. I may never be able to do this = It's impossible for me to ever do this ('never' negates 'may')
2. I may never be able to do this = It's possible that I will never be able to do this. ('never' negates 'be able')

Which is the correct one?