Me desmoraliza ver que a mis alumnos no les interesa nada una asignatura que a mí me apasiona.It demoralises me to see that my students are not at all interested in a subject that I'm passionate about.
Suspendí el examen, pero no pienso dejarme desmoralizar. Seguiré estudiando hasta que lo apruebe.I failed the exam, but I won't let myself be disheartened. I'll keep studying until I pass.