I often find myself spacing out

Either I'm too aware of everything or I'm not. I often feel as if I'm missing details, missing something when I'm aware of the world. It's just that I'm always so lost in my thoughts, in my head and I try to get back to reality, but it's so hard being aware of everything. Like I can understand people, what they want, what they are feeling, but I won't remember what they are wearing or any physical details that might have changed. I also just started learning how to drive and my situational awareness sucks and I have no idea how to improve it. I have to be alert constantly and it's so ridiculously easy for other people, simple as breathing, but for me, it's so hard to get out of my head. Do any of you have any advice for this?