Did something ever happen to you in the past that you've had a hard time letting go or someone in your life that you are having a diffucult time forgiving? This advice really hits home with me right now, and couldn't be better said. Hope this works for you too.
“ Whatever life takes away from you, let it go. When you surrender and let go of the past, you allow yourself to be fully alive in the moment. Letting go of the past means you can enjoy the dream that is happening right now."
~ don Miguel Ruiz