I'm 'ashamed' [='embarrassed'] 'to admit' it, but I still don't know how to ride a bicycle. = I'm 'ashamed to say' I still don't know how to ride a bicycle.
We were too 'ashamed to go' back to school. [=we didn't go back to school because we were too embarrassed]
She was 'ashamed' that she hit her brother. = She felt 'ashamed' for/about hitting her brother.
(..) She's not involved. Then why does she try to get my daughter to speak? I did no such thing. You are a teacher. Aren't you ashamed? Why did you ask her if I hit her mum and she lost the baby? I never did. You pick on a -year-old's drawing (..)2011 A Separation
(..) She admitted that she tied his father to the bed and locked him up. I explained to you why. Her child just died. Keep your voice down. Aren't you ashamed? You call yourself a man? I said quiet. For God's sake, listen to us for a change. He is twisting everything. (..)2011 A Separation