Time is very subjective. Present, past and future are just a function of our linear mind that try to make our world easier to understand. Nevertheless I don’t let the thought of a complicated universe keep me from sleeping: The future comes and gets closer but it never arrives, because when it does it’s no longer future; it’s already present. On the other hand you can’t do much about the past, but to learn from it. Bottom-line is that there are very few things that you can do about the past and future, so focus on the present because it is the only time that exists and that you can work on. Focus on the present and it will give you good memories of your past and hopes for your future.