Alright, so I got 2 layers of paint on my car but I can see roller marks big time

I'm doing it in flat black by the way if that helps to solve my problem

So basically, I cant paint without having thos horrible roller marks. I am now wetsanding it all in order to get a uniform ( lol ) coat to try again

Also, I barely get any orange peel with flat color, I could almost call my car done if it wasnt for the horrible roller marks. Is there a way to avoid it? I'm very bad at this