Hi there,
I have had the same sort of problem and came across this tutorial:
https://www.youtube.com/watch?v=JrcAo0VuL60
I think it's pretty helpful in some ways. Talks about ways to arrange, relative major/minor keys in a pretty simple way.
You can direct message me I think if you like and send me some of your lyrics including the chorus: I'd be interested to see what you mean by struggling.
Hope this helps. I'm quite new to this all to but finding it very interesting.
Cheers,
theMolster