I would say stick to it! Desire and motivation are much more useful than experience. And I think your persistence should demonstrate that. The experience will come but having the drive to not let anything get in the way of your end goal is not something that everyone possesses. As far as the CISSP or certs in general they are a good gateway to say that you have the foundation and methodology down and if that is what they would like you to have I would get it. Just remember there are continuing education requirements and other things that go along with the CISSP or G-PEN or take your pick. So I would ask if they will be willing to stand behind a commitment to your continuing ed if they are insistent on the CISSP this may reveal their intentions. Good Luck and keep at it!