I am confident you are looking at this and thinking to yourself "it is a lot easier to say than do". I am here to say - I have been there and I understand.
What do you let go of first? The anger, the disappointment? People that are bringing negativity into your life? Or is it something even more significant?
Only you can answer it. I am just here to say by doing so, you open up space for the Universe to replace it with something more beautiful and wonderful -- FOR YOU. By hanging on to the old there is no room for the new.
It is okay, let go - breathe and believe in the new coming your way.