If you're struggling today, remember that life is worth living and believe that the best is yet to come. Remember that you are loved, you matter, and never forget that there is always hope.
Whatever you did today is enough. Whatever you felt today is valid. Whatever you thought today isn't to be judged. Repeat the above each day.
Though you are as a drop in the ocean, without you, the universe would be empty.
Yes, the human race is a small species in an infinite universe filled with many other planets and many other things, but though small; this race is bearer of very great and big things: Destiny, Virtue, Hope, Love... and that's what makes this species different. That's what makes this species very shiny and very visible and very important, in a whole, whole, big, big, vast, expanding universe!