I used to be infuriatingly honest as a teen and in my 20s. I'd tell everyone everything. I was a total people pleaser and wanted to be seen as "nice".
Fuck that. I started to realise that nobody else was sharing a thing with me! The very same people I'd told my salary to, how much I had in savings, etc. Then my uncle died, and my aunt and cousins totally clammed up about how much he'd left, when they'd bossily demanded the exact same info from my mum when my dad passed. It was then I realised other people can be utter twats.
It's none of their business, op. If you don't want to be probed, don't say anything like "wouldn't you like to know?" Just tell a white lie, or say "it cost enough, I'm wiped out now!" and the move it on. It's nothing to do with them.