alexithymia

for all of us out there that are incapable of telling them how we really feel

alex·​i·​thy·​mia (noun)
inability to identify and express or describe one's feelings

"Individuals with high levels of alexithymia are usually aware of their emotional arousal; however, they have difficulty differentiating emotions and verbalizing them."
- John S. Ogrodniczuk et al., The American Journal of Psychotherapy