Thought awareness is the process by which you observe your thoughts for a time, perhaps when under stress, and become aware of what is going through your head. It is best not to suppress any thoughts - just let them run their course while you observe them.
Watch for negative thoughts while you observe your 'stream of consciousness'. Normally these appear and disappear being barely noticed. Normally you will not know that they exist. Examples of common negative thoughts are:
* worries about how you appear to other people
* a preoccupation with the symptoms of stress
* dwelling on consequences of poor performance
* self criticism
* feelings of inadequacy
Make a note of the thought, and then let the stream of consciousness run on.
Thought awareness is the first step in the process of eliminating negative thoughts - you cannot counter thoughts you do not know you think.