Hi,
Rather than look for a "meaning" You should consider what a dream does during sleep. Every dream weremember is dreamt to do acertain task or respond to an externalor internal(psychological) influence.
Your dream depicted how you felt during the sleep; cold and full of responsibility for the students in your charge. You may not admit it to yourself, but you feel some dissatisfaction with your present job. It is not easy to deal with people with learning difficulties. I know, as I did voluantary work for over 18 years.
You always worry about safety and sometimes irrational behaviour.
Regarding the dream scenario; the sobconscious can create one out of its own iagination. Usually it is a mixture of creative imagination some personal experience/memory.
The last part of your dream contains waking elements; frustration, fear and the the fact that nobody seems to care about the problems.
Over all the dream indicates that you feel alone with your responsibilities.