About 6 years ago my half-brother contacted my mother, his birth mother, in order to meet her. The two of them met, visited a few times, and have drifted apart. Half-brother and I, however, do not have the same emotional issues that my mother has, and I think that has made it easier for us to establish a relationship. There are no feelings or guilt or disappointment, we can just enjoy the fact that we found one another. Perhaps you and your birth aunt will have a similar experience.
I would recommend going with the flow and keeping your expectations relatively low. Keep an open mind and heart and I wish you the best.