I'm entering the 4th year of my STEM field PhD at a prestigious institute in Canada. My supervisor is a bit terrible; never around, and often with fantastical ideas that are much harder to realize than he thinks. I'm starting my 4th year this fall, and my first two projects have failed. Now, my supervisor has provided me a new project of which I am not too stoked on. It relies on a collaboration with another group, and involves a lot of waiting time. I'm worried that the clock is ticking and I have nothing concrete to work on. I have one 4th co-author paper in a reputable journal, but I don't foresee publishing soon due to a lack of success. Perhaps it's bad luck.
Others who are in or have done their PhD - is this normal to experience at this point? Or should I start to worry about my ultimate success?