Hi Cam,
To answer your question; No you are not wasting your time. Supplements don't make or break ones progress in or out of the gym. Good natural sources of Protein, Carbs and Fat Sources will always trump supplements in my opinion. If you eat well and make wise choices with regards to food sources then you will not need to rely on supplements. Personally, from experience I have tried alot of supplements but utimatley real food has been my main staple and I have achieved great results sticking with this philosophy and so can you! For example; I no longer take pre workouts but instead I sometimes drink tea or coffee to give me a little boost if I need one after a long day.
I have written a few articles that can aid you with regards to advice on nutrition, exercise and making lean gainz (Articles can be easily found on my profile)
I hope this advice helps :)