Did you ever have someone take credit for something good you did? How did you feel about it? How is this like plagiarism?

Did you ever have someone take credit for something good you did? How did you feel about it? How is this like plagiarism?

Yes, someone has taken credit for something good I did before. How did I feel about you, you ask? I felt like it's not right. It's almost like I'm breaking my back for you. I'm doing all the work and you just copy-cat me and use my good knowledge and put it on paper. It's like plagiarism because however you look at it, it's literary theft.