nerdymama wrote:
I will talk about all sorts of things. Usually I will either try to initiate a conversation or hear something that is somewhat relevant to something that I know or find interesting and start talking about it. I tend to talk about anything science, math, or psychology related at any opportunity.
I don't know if this is what you were looking for in an answer. If not let me know.

Absolutely nothing wrong with any of those subjects but they don't tend to come up very often in everyday conversations. Well they do, but it's is usually faulty information that they read in some trashy magazine somewhere next to the gossip section (the latter of which is what they were really looking for lol).
I find it hard to find people to converse with at times. I like to get into a good debate about subjects of interest and most people would rather chitty chat about their washing, their sex life, their partners, and the local gossip.
For example, at the moment, I am most fascinated by fossils, palaeogeology, palaeontology, evolution and palaeolithic nutrition. These are not things most people I encounter get excited about. They are too busy getting over excited about the latest news about some famous boy band or 'it' girl I have never heard of.
I also prefer to spend my Friday evening studying and people just cannot comprehend that at all. They think I should be out partying! Gah! Really, I am happy sat in looking at my fossilised rock (the last one I looked at was the fossilised remains of a crinoid, otherwise known as the 'sea lily' which is still about today but was most prolific during the Palaeozoic. It was most exciting to view and it makes me ponder about the fact that this animal was alive in a world that I will never personally experience because much of it has long gone including many of the life forms that were walking the Earth at the time. What was that world really like?)...
Also at the moment I am studying seismic waves and what they can tell scientists about the structure of the Earth's interior. I am learning about P Waves, S Waves, Love Waves and Rayleigh Waves, the speeds they travel at and the types of movement they cause in the earth, as well as how they use them to investigate the interior.
Before that there was also an interesting section on the Earth's mantle and peridotite which contains olivine. That is also most interesting.
Anyway, if I wanted to go and party I would. People don't believe me though....
Personally, I was going to study psychology at one point but changed courses at the last minute (lost a lot of respect for the psych profession over the years and still like the subject of psychology itself in some ways, but some parts of it were frustrating me due to what I consider to be incorrect theories and lines of thought. Basically I am too subjective in regards to that subject now and it got me wound up about my personal issues and my lack of success with therapists who still, to this day, insist that socialising will come naturally to me and that I will enjoy spending hours sitting around talking about irrelevant rubbish instead of studying...gah!). I now study the Earth sciences and that uses a lot of maths...so I see nothing wrong with your chosen subjects. Indeed all of them can be most interesting.