Reading your story felt like looking into a mirror behind my back. I used to do the same thing. Leave everything for later, until I couldn't anymore, make decisions out of the blue because why not... I justified it, said that I'm just messy or spontaneous or whatever else suited the narrative at the time. I never develop the skill or maybe habit of organization. I started very late - everyone was miles ahead of me. But slowly, bit by bit, habit by habit, day by day, I fixed it. I would always dread cleaning my room because it would take me hours to get it to a decent state. I hated washing up (I still do to be honest, just less) because the remaining food would be borderline mouldy. Now I spend 5 or 10 minutes every day cleaning my room and 99% of the time it looks good enough for me to invite people over without shame. I do the dishes right after eating and it doesn't gross me out anymore.