If you really want to be happy, Leo, then surround yourself with happiness.
While it's true that you can't possibly control every element that intersects
with your life, you can certainly seek out and find happiness where it does
exist, and with the right attitude you can actually create happiness in your
life. Don't build walls around yourself and then expect to find reasons to
smile. Happiness is a choice, and you are in control. Events of the last year
that were sad or hurtful may be on your mind, but they can only stay if you
invite them to.