How to overcome fear of opening up in a journal?

Hi! I'm new here and am constantly inspired and fascinated with the idea of journaling every single day. I've been on and off journaling for about 10 years now (Like maybe 4 entries every 6 months).

But one thing that consitently hold me back is what if I die in a plane crash and my family goes and reads my journals? Or what if my future kids are playing around in my room and find my journal and I wrote about how I don't want kids at all years earlier? Things like that.

Obviously I know journaling is for me, for my memories and for my mental health. But I find it hard to be 100% transparent knowing that maybe one day my thoughts could ruin lives (A bit dramatic but still).

Any tips or ways you have overcome that fear? Thanks!