Is it really that tricky? Life on Earth evolved from single-celled organisms and the right chemical reactions, triggers etc... What's to stop that happening somewhere else in the vast expanse of the Universe?
Oh, believe me, I used to be old and grumpy when I was younger. When you get to see humanity as a whole, over many years, from the beginning to the end, to where you have branched out across the Universe to populate other worlds... it's a different perspective. You probably don't want to know.
Just live life. You have a family? Be with them, do things with them, be a family. This island is a paradox, treat it like a free pass, live. Question, yes, you should always question but don't let that be all you do. Enjoy the chance of life you have now... some of us don't get the chance to live how we want.