Should I tell him I've never been a relationship/date before?

I am 24 and I feel a bit insecure about telling the guy I am dating that I haven't date anyone else before. How should I answer if he asks about whether I've dated anyone else or how many relationships I've been in? Which one is the better option?

I've never been in a relationship before.
I'd rather discuss this later./ Can we talk about this later?
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Should I tell him I've never been a relationship/date before?
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