I find it very hard to study, I am not procrastinating. I need help, please answer.?

Okay, so I have two hours to complete different homework each day but I find it very hard to do them. I do not procrastinate, I turn off my laptop and put it under my pillow and I turn my phone off so I don't have any distractions. I focus only on my work and only on it. But I can't do it, my mind just goes blank, I just stand there again and focus on the task and nothing comes to mind. Nothing. And I don't get to finish homework and assignments. I focus but nothing comes to mind and I end up doing nothing. My homework is due in tomorrow but I don't have any time to do it as it's almost bedtime, I've been trying to do it for hours and I got nothing? Why is this?! And don't tell me I'm procrastinating because I'm not, I'm focusing on my work and still get nothing! What do I do about this? What am I going to tell my teachers tomorrow?