I'm not ashamed of it, but I don't go around boasting about it either. (Para. 11)
Meaning: Although I don't feel embarrassed or shame about my job, I don't go around telling people that I'm very proud of it.
be ashamed of: feel embarrassed or shame about
I feel ashamed of myself for making such a silly mistake. 犯了这样的低级错误，我感到惭愧。
People should feel ashamed of polluting their environment. 人们应该为污染环境而感到内疚。
boast about (also boast of): speak too proudly of
It's disgusting to hear him boasting about his new car. 听他吹嘘他的新车真让人恶心。