I didn't hit my groove of confidence until I hit 35. I had a shocking childhood with awful parents who always left me feeling out of sorts, didn't make any effort, I sailed through school with no assistance but never had the right books for class, wasn't picked up from school, was left to my own devices and was bullied horrendously in school.
Having had to leave home at 19 (my one remaining parent did a runner from the house I'd rented for us and left me with the bills) I coasted through years of awful career decisions, no money and always felt like the outsider in social groups. I then married a horrible narcissist who had multiple affairs behind my back.
Then I snapped. I realised all of a sudden that the whole world had taken me for a ride but I'd got to a good place in my career (even though my husband was keeping me stomped down so I wouldn't leave him) and I applied for a leap of faith job and got it.
6 months later I left the crappy ex despite his threats of "you'll crumble without me" and I went it alone. Bought my first property, sailed through the first couple of years in my job and now I'm 12 years later with an amazing husband, great job with an amazing employer and happy as Larry.
The confidence only kicked in when I told myself that I was a survivor and needed to prove it to myself. But I have a very strong moral code, always call out anyone I see being treated unfairly and I massively overthink things. But I'm happy and very confident although I like to think I'm liked and relatively inoffensive.
I'm very cautious about the outward display of success or confidence that some people like to put out. I'm paranoid about ever bragging anything on social media (haven't touched it for a few years) and I keep myself to myself to a degree. But Im definitely loud and proud without that nobinshness of "look at me" (I hope)