Big ideas will take a long time to develop into something useful. High speed trains, airplanes, smartphones, fusion reactors, spacecrafts are all proofs of this concept. These were all once deemed impossible at one point. Don’t give up just because something is difficult right now. Bodybuilding, running, mastering any sport and any type of self improvement are of similar concept.
Every worthwhile thing takes time. Time pursuing something of interest is not wasted, as time will pass anyway and you will grow during the process. Embrace the intrinsic value of knowledge, innovation, virtue. They are limitless.