I remember my first tech jobs in the dot-com bubble of 1999-2001. I could see my managers doing everything wrong, but couldn't convince them why it was wrong. I thought it was because I hadn't been to business school. Now I know it was because I was 22.

You're just going to have to "grin and bear it" for 3-4 years before people will start listening to what you think. In the mean time, focus on showing up every day on time, wearing a clean shirt, using your manners, and learning to do whatever they're asking you to do, really well. Those things will distinguish you from the other fresh graduates more than you'd think.