When a negative though come to your mind, just replace it with positive one.
Decide that from this very moment you are changing yourself by leaving negative thinking behind and starting the way towards positive thinking and behavior.
If in conversation you realize that you are using negative words, switch to positive words.
Grasp positive attitude into your life. Have more faith into yourself and expect positive results.
Be more optimistic by saying “I can” instead of saying, “I can’t “. Most of the people know that they “can” but instead of that they choose to say “cannot”, due to their fear, laziness or lack of self-confidence.