In spite of yourself
Definition 1 of 1
Pro Tip 1/3Unplanned Reaction
Refers to an automatic response you didn't anticipate, showing real feelings. 
Even though he was angry, he helped her, in spite of himself.
Pro Tip 2/3Unexpected Enjoyment
You might enjoy something you thought you wouldn't, surprising yourself. 
She found the silly movie amusing, in spite of herself.
Pro Tip 3/3Reluctant Admission
Acknowledging something positive that you are reluctant to accept. 
In spite of himself, he admitted that the critique was fair.