My mother was an over sharer and it made me incredibly anxious. I grew up before my time. Being thoughtful about the impact knowing too much too young is a thing.
I guess we're all shaped by our experiences. My mum was very much like you, and she believed that children should be protected from adult worries. I hated it, because I was very perceptive and always knew when she was worried/stressed, even though she thought she was hiding it well. I just didn't know why she was worried, so my imagination filled the gaps. I was determined to be more open and honest with my own dc.
DD is very perceptive, like I was. She can read me very easily, so I am always honest with her about what's going on. If I'm stressed at work, I don't hide that from her at all; having said that, I have always worked in roles where I can't necessarily share the most stressful aspects of my job even with dh, because it's confidential. I therefore have proper professional channels for helping me process and discuss those things.
We are fortunate enough not to have had major money worries when dd was younger, so there was nothing there that we couldn't discuss in that department. She was aware of conversations about paying off the mortgage early, switching utilities, maximizing savings etc. I was then made redundant last year, and as the main breadwinner, that was a concern, so we talked about it as a family and agreed to tighten our belts until I was able to find something else. I didn't burden her with my worries at all, I actually think she worried much less because we were able to talk about it openly.
And again, I'm currently dealing with a significant health scare. I have been open and honest with dc about what's happening without "dumping" on her, because that's what I desperately wanted from my mum when I was a kid. DD is confident in the knowledge that she knows what there is to know, that I will keep her informed and that there isn't a whole layer of secret shit being hidden from her. I don't expect her to mop up my own angst or worry, but I also don't want to hide stuff from her either, because my own experience tells me that hiding stuff just damages trust and leaves the imagination to run wild.