I have some insecurities that prevent me from talking to girls, the biggest one being small penis.(pretty nasty one to have)

I realise pretty much the problem isnt my penis but my insecurity. I have this paranoia that a girl will reject me because of my penis and somehow word will get around. I dont wanna prevent that from happening, I accept that it probably will. I just dont want to be paralized by fear. I seriusly cant even talk to girls anymore at because of it. It sucks.

So to summarise, do you guys know of a good book on that subject? Perhaps with exercise or something that I can start implementing. I know this isnt a thing that you just fix overnight. But im really fucking tired of my penis size insecurity preventing me from living my life. I am ready to put in the work. I just feel so weak. I hate how I am so insecure. I feel like myself from 3 years ago would look at me and cringe at what a pussy I have become.

So thanks! And guys like I said this a pretty deep rooted problem so advice like "be confident bro, who care what they thi..." wont really help. Even though I know you mean well. I understand logically that giving a fuck in this scenario isnt helpful to me. Its my emotions that do their own thing.

Tl:dr: Suggestion on books/material on not caring what people think of you?