You can't go back in time, so even if there were elements of overconsumption etc, what matters now is how you want to live going forward.
I don't know why people STILL try and add to the feelings of shame by acting like you're hypocritical now.
All of us are guilty of overconsumption tbh.
There are loads of emotional reasons we can find it hard to let go of things, or buy the wrong things or too many things to begin with.
There can be loads of reasons someone finds themselves overwhelmed, and want to make changes.
Have you watched the Stacey Solomon 'sort your life out' programmes.
I love how understanding and real they are about it. It's really inspired me, and I've made some real progress with this.
Previous shame actually paralysed me and stopped me dealing with it. Now I try and be nice to myself and it makes me much better at actually doing it.
I'm doing things like sorting carrier bags for charity shops and trying to take one or two into town whenever I go, or to clothes banks.
I've also made a start getting things onto vinted. Took me ages to start doing this, but its much easier than I thought. Even if I don't get what it's worth, it's better than having it sitting there doing nothing, and the money I spent on it was already wasted, so it's the old sunk costs fallacy.
You can do this!
Do one corner of a room, or one bookcase, one junk drawer.
Make the tasks smaller and more manageable to help avoid overwhelm, and be as ruthless as you can.