Just go home. Why are you still planning on building a big boat - that sci-fi notion of a metal-hulled "ship" no less! - when you should be worrying more about your little island? We have problems here! Our resources are dwindling, people are starving! Your dreams mean nothing in our everyday lives.
Whether you live on that little imaginary island or living on a planet in an empty region of the Milky Way, the arguments are similar. To our ancestors, intercontinental travel would have seemed as insurmountable as interstellar travel does now (interplanetary travel is currently a feat we only dare send robots!). But in the case of intercontinental travel, mankind did succeed, driven by a basic need to explore.
But for mankind to become interstellar, the motivations are a lot less clear and the technologies needed are less certain. It's for these reasons that interstellar projects are often resigned to the realms of science fiction.
In a recent New York Times op-ed, Adam Frank, professor of physics and astronomy at the University of Rochester, went on the offensive, saying that interstellar travel is nothing more than Hollywood fantasy. Forget the fact that decades of research has already gone into interstellar concepts, according to Frank, the void is too vast for us to traverse, so give up and come to terms with being a mono-planetary race - no USS Enterprise is coming to rescue you.