No I'm not delusional but when alone I talk to myself. I find I am rehearsing conversations I need or am likely to have - and several versions of the same. That way I feel prepared before finding myself attending a situation. I always try to have an 'out' or escape. For instance, at functions I keep myself busy volunteering doing something. That allows me to keep conversation brief and to the point. When bumping into people, I have no qualms about making an excuse to be elsewhere when things get uncomfortable.

Speaking of being uncomfortable... it is the silence in a conversation that makes me anxious. I have always felt the pressure to ensure they are filled - and it is these times that I get tongue tied or find myself afraid of saying the wrong thing. It has taken a great deal of effort but my fight not to fill the voids is getting easier and so lessens the anxiety as a result.

I have heard from others that Toastmasters is an excellent program for putting oneself at ease with both general conversation and public speaking. Maybe a support group (whatever diagnosis you have) could be a great source of practising conversation; after all, it ought to be a safe and supportive environment.