The synonym that describe the greatest degree of regret would be : D. Repentant : Feeling remorse to a degree marked by an extreme change
For example, people who felt repentant because he tend to scam other people make a drastic change and decided to became a monk in Asian continent
hope this helps
Answer:
I try to speak but
My mind is deep in thought
They're calling me back to earth like I'm an astronaut
[someone who spaces out often]
or
I don't hate you
I just need some time alone
I'm sorry I can't stay
I'd rather be at home
[introverted]