I used to be the same way — do you drink caffeine after 4PM? I was convinced I was a night owl and my most productive hours were 10PM until 2AM. That was until, at suggestion of my partner, I stopped drinking caffeine in the late afternoon and evening. As long as I do that I have no problem getting to sleep consistently and easily.
May not be the case for you but for my entire 20s I simply didn’t realize how much caffeine was actually impacting me.