Don't understand

Do understand why people do what they do 

I study psychology to try and understand better but it never works 

Sometimes I don't feel human because I don't understand 

When I tell you something hurts why keep going 

If I say I don't think it's good to do that why keep doing it 

Why go back to things that hurt you if they harm you 

Why hurt me when I've been good to you 

These are all things I've asked and have seen happen over and over again and hell have even done

I say I don't feel human but I do these thing so shouldn't I know? But I don't.

I don't understand