The only reason I completed a side project was because I had people that I cared about that wanted my side project done to help them out. In other words, I had social motivation and collaboration. For me, going completely alone on something is much more difficult because its like the tree the forest making no sound (perception) if no one is there to hear it. It doesn't seem to have that connection or impact of meaning unless I have others that care that I have direct interaction with.