Don`t give up.Try and use 3 different features to positively identify your turning point/on-route way point.For example ,if one of your points is a small town/village,try and identify 3 unique features,like a railway line or major road or ground feature that can be identified from the air,as one small town looks pretty much the same from the air.
Speak to your Instructor and see whether you cannot sort out some little Nav exercises before going off on the big one again.
You could post this question on the Instructors forum,there`s loads of experience there and I am sure they would help.