I have similar problems. Some of it might be because of underlying issues we'll probably never learn about it, but some of it is also social media and information overload.
There's so much shit bombarding us every day, all engineered to provide a dopamine fix and I 100% believe it's affecting our brains.
I have to force myself to only check my phone at certain times, and ensure that I don't use it too often. Ever since I have enabled night mode on my iPhone I find myself less distracted and getting better sleep. I also put apps like instagram, snapchat inside folders on a different page so they are always out of my sight.
There's so much shit bombarding us every day, all engineered to provide a dopamine fix and I 100% believe it's affecting our brains.