Q. Is there anywhere I can check my work for plagiarism?

FSU Libraries' has a Research Guide that can help you identify plagiarism. Visit http://guides.lib.fsu.edu/plagiarism.

There are free tools online. One I found was successful with three different academic journals I tried. The address 

is https://smallseotools.com/plagiarism-checker/ 

There are some advertisements (well, a lot of them) but it's free and effective.