I got some advice from a YouTuber who has approx 100,000 subscribers (and growing rather fast).
I was going to do a Q&A when I hit 500 subs on my old channel, and he advised me not to. Why? Only about 10% of your subs will watch your stuff, and only about 1% or less of those people will bother to ask you a question. That's about one or two people in your case.
What you want to wait for is less 'I am asking a generic question to be polite' and more 'I am REALLY interested in your life and want to know EVERYTHING about you'.
Wait until you hit something like 1,000 subs. You'll have genuinely interested subs, hungry for info then!
(congrats on 100 subs btw!)