I'm not cold, but when i put my teeth close together there is chattering. i don't have any tmj issues nor anxious. been happening for 7 years now.

Tremor?: It sounds like a type of tremor that may only be obvious when your teeth are close together because the range of movement is small. An evaluation by a neurologist will be helpful to assess the nature and treatment options for this.

See a physician: I doubt this symptom is of dental origin. I believe you should bring this to the attention of a medical doctor.

Muscle spasm?: At that vertical distance, you may be at a muscle length that is not comfortable to sustain, causing a mini muscle spasm which chatters your teeth...

Not TMJ: Doesnt sound like TMJ. Ask your dentist for opinion.

Oral dyskinesia: Oral dyskinesia consists of abnormal, involuntary, uncontrollable movements and teeth chattering. This is a neurologic disorder and visit to a neurologist is warranted.