freshman year grades affect graduate school?

I am a freshman in college and I am having trouble adapting to the new teaching and learning system that college has. I’ve taken quizzes and exams and received unsatisfactory grades (at least for my standards) even though I study really hard and genuinely feel like I know the material :(. My mom is pushing me to get a 4.0 so I can get into graduate school. I feel like I’m under a lot of pressure and like I won’t get into graduate school if I do bad right now. Is that true? I think I just need a while to adjust to the new system. But right now, for the first time ever, I am not doing well in school. And it’s freaking me out.