One common misconception about meditation is that meditation is and end goal, not a practice. That to meditate is to sit down and have your brain be quiet, and if you can't do that, your session was a failure.

But that's like saying weight lifting is about deadlifting your body weight, and any session you don't manage do that was a failure. That is something you might be able to do after years of training. But you start with the smaller weights, learning form and technique, setting reasonable goals, and find a practice that you can make a habit out of. Because a five minute walk every day beats a day at the gym/retreat once a year.