It's great that you were able to talk about her fears with her and show her that you have some understanding of them.
As for channeling your enthusiasm for talking about flying away from your wife, I recommend forums like this, starting a blog or chatting with your instructor and other students/pilots at your school when you are not flying. There could be some contacts you make through this forum who might live not too far away and you could organize a fly in or a monthly meeting at the pub so you can get all that talk out of your system.
When non-fliers ask me if flying is safe, I inform them of the probability that you are far more likely to die driving to and from the airport than through any flying you might undertake from it. The media has a lot to answer for in portraying aviation as being far more unsafe than it actually is.