Should there be a nobbly bit where both collar bones end near throat is i suffer anxiety and left side seems to stick out more normal? (feels boney)

Anxiety: It sounds as if you have anxiety and are overly concerned with your body parts, particularly bones in your neck. All of us have parts on opposite sides of our body that may be different. Some people have one breast larger than the other, for instance. As long as you have no significant pain, this is nothing to worry about.

Probably Hyoid bone: There is a free floating ( only attached by muscles) bone called the hyoid near where your describing. I suspect that this is what your feeling and it s perfectly normal. This is easily discerned by a quick exam.