Shy guys, how should I start a conversation with this shy man? Do you think he is not interested?

I already asked his name some months ago because he started flirting me. Now I want to know more about him, but I don't think he is going to like if I ask personal questions.

I tried two times to ask him, but he couldn't answer. I only asked how was living in Japan. The other day I asked his opinion about something related to Biology. He changed the subject both times.

I thought he was not interested, but he hovers where I go and try to get my attention. Most of the time I don't know what's going on. Confusing.
Shy guys, how should I start a conversation with this shy man? Do you think he is not interested?
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