How to remove words from your mind!

Type

Yesterday my doctor told me if I'm to live a happy life I must remove the words, "should, could, would, always, never..." and some other words I already forgot from my vocabulary. How do I do that? She said these words are killing me. She said I can't change the past and I can't predict the future so why worry about stuff I can't change. How can I take these words out of my mind? It's like if I said, don't think of boobies! Did you think of boobies? I did. Were they big floppy ones, or lil' perky ones? Big silver dollar aureoles, or small erect nipples? Yeah, boobies are fun. Hmm... Where was I?