I converted from rapidly lapsing PPL(H) R22b, to 3 axis microlight when in my 40's, took me over 12 hours to get to the point at which the instructor sent me solo. I was surprised and frustrated by my lack of progress.
I really struggled with the speed/angle of approach being different to the helicopter and how much they are tied to each other. In the helicopter the speed of approach and rate of descent are almost independently variable, almost any approach is salvageable. Until you learn to sideslip bigtime you do a lot of overshoot/go-arounds.
I had a lot of "un-learning" to do before I cracked it. Once it clicked it didn't take many hours to finish the sylabus and get through the GST.
Keep at it, try to enjoy it, it is definitely worth it in the end.
Rans6...