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.
(..) Don't be insulting, Rajesh. So, Sheldon, tell me more about this princess you say I look like. It was said that the gods fashioned her eyes out of the stars... ...and that roses were ashamed to bloom in the presence of her ruby lips. Oh, my. - Back off, Sheldon. - What? (..)2007 TvShow: The Big Bang Theory Title: The Grasshopper Experiment Season: 1 Episode 8