Don't expect to change everything, or be the one responsible for countering these various problems or stumbling blocks. Well, there are instructors out there who would assure you that tasting humility on a daily basis is a reality for many of us. Sure, well take satisfaction in your small successes, and again don't expect to change anything. That's why I think it's often unfair to talk about teachers having to motivate students. Teachers shouldn't have to motivate students, they should always provide learners with opportunities.
Learners have to motivate themselves.
You can provide for them opportunities to think of things that they might not have considered otherwise. Also, don't expect that your influence or success will appear immediately. There might not be any indication of success until years down the road. Which in itself is a large frustration for teachers, and parents as well. So, as a parent I take satisfaction in that I did the same thing as a child, and the cycle is repeated, so to speak.