Guilty

/ˈɡɪlti/

conscious of, affected by, or revealing a feeling of guilt.

"he felt guilty about the way he had treated her"

Lonely
/ˈləʊnli/ sad because one has no friends or company. "lonely old people...

Hurt
/həːt/ Cause pain or injury to. "Ow! You're hurting...

Depressed
/dɪˈprɛst/ depressed (of a person) in a state of unhappiness or...

Despair
/dɪˈspeər/ the feeling that there is no hope and that you can do nothing to improve...

Vulnerable
/ˈvʌln(ə)rəbl/ exposed to the possibility of being attacked or harmed, either...

Sad
/sad/ feeling or showing sorrow; unhappy. "I was sad and...

Emotions Wheel
I have enjoyed working with the emotions I found in Plutchik, but there are so many more...