Ask stupid questions often and pursue answers.  These stupid questions are really smart...Who am I?   What is engineering?   What is a weld, really?   How can something turn from a liquid to a solid within a liquid (concrete underwater)? How come I don't add that tension force I calculated to the pretension already within the bolt shank from tightening?   If you are constantly thinking about these types of questions, you are in great shape.  In order to maximize your well being now, you need to pursue answers to all your questions, and think up new questions to pursue.   Engineering, like the good life, requires this and your efforts will result in lifelong learning (ie happiness according to Aristotle).