Would this be considered plagiarism? I'm currently about to finish my BA thesis, and my topic is bullying. I have read several books, studies, and such that can be connected to my topic. I finished the literature review, but haven't touched it since. However, when I recently re-read it and looked at the sources, I have found that a lot of my sub-chapters in my lit. review are really similar to those in the literature. For instance, in the work I read, the author mentions the consequences of bullying and I also have a sub-chapter dedicated to this. Or for example, I have read about strain theory in another one of the studies that I have also included and wrote about in one of my sub-chapters. I did not include every single aspect of these particular studies, just specific parts that I found relevant in my study.

My question is the following: Is this considered plagiarism?
Plagiarism is taking the work or ideas of others and presenting it as your own. If you have a sub chapter on topic X and somebody else has a sub chapter on that too, that doesn't make it plagiarism. E.g every 2nd grade math text probably has one chapter on addition and one chapter on multiplication. That doesn't mean they are plagiarizing each other, it's just the natural way to split up the material. What would be plagiarism is if you got the idea to have a sub chapter on topic X from reference Y but you did not cite reference Y and you made it sound like you personally came up with the idea of a sub chapter on X on your own. As long as you've cited your sources properly you should be fine.