Hello preciousthing: Well I don't have any particular experience with this nor am I a specialist in this area.

But I believe this is your first posted thread here on PC. So... I thought I would say welcome to PsychCentral!

I hope you find PC to be of benefit.
I noticed your first post, here on PC, was in reply to another thread on this particular subject. So, as you are already aware, this is not the first time this topic has come up here on PC. You mentioned you've started doing yoga & you're going for therapy as well as reading inspirational books. That is all good stuff to be doing!
I'm not a mental health professional. However what occurs to me, with regard to this, is that perhaps it has less to do with your anatomy & more to do with anxiety which happens, in your case, to be focused on the size of your penis. The one thing I know is that the more preoccupied one becomes with things related to sexuality in general the more troublesome they become. It can become a vicious circle, so to speak. So my thought would be that perhaps the more you can de-emphasize your anatomical concerns, & also do as much as possible to work on reducing your anxiety level in general, perhaps the better you will do. I don't know... just a thought.
Here are links to a bunch of articles, from PsychCentral's archives, on a number of different topics that I thought might be helpful in trying to figure out how to address your concern:
9 Ways to Reduce Anxiety Right Here, Right Now
15 Small Steps You Can Take Today to Improve Anxiety Symptoms
Top 10 Lesser-Known Self-Help Strategies for Anxiety
4 Breathing Exercises to Reduce Your Stress Right Now
3 Deep Breathing Exercises to Reduce Anxiety
https://psychcentral.com/lib/20-tips...dium=popular17
https://psychcentral.com/blog/how-to...y-for-anxiety/
https://blogs.psychcentral.com/life-...anxiety-daily/
https://blogs.psychcentral.com/imper...s-and-anxiety/
https://psychcentral.com/blog/4-jour...your-emotions/
https://psychcentral.com/blog/using-...o-reclaim-joy/
https://psychcentral.com/blog/why-ru...d-how-to-stop/
https://psychcentral.com/blog/8-tips...op-ruminating/
https://blogs.psychcentral.com/cuban...dy-dysmorphia/
https://blogs.psychcentral.com/anxie...out-your-body/
My best wishes to you...