We cannot do it all; of course that should not dissuade us to be lazy or not attempt to reach goals we have set for ourselves! As other's have made similar comments, having a good balance of activities leads us to pursue our interests, grow, have hobbies, and be involved in our communities. Everyone varies, but I would recommend to:
Exercise 2-3 times a week Have social time with friends at least once a week Make effort to stay close to your family Give yourself free time to explore/grow/have a hobby Eat fresh/local/natural food to maintain your health Donate your time/talent/treasure to others Always invest in growing/learning
*Also - the mere question of asking how we can do it all implies that this life is the only thing worth living for. I might get down-voted here, but there is a life after this one, through Jesus. Having this understanding gives me peace in so many things. I would recommend exploring Christianity/Catholicism if you haven't yet before.