I'm insecure about my dick size, my ex said it was "big".

I'm 5.5 inches and 4.75 girth, Its like a tiny deodorant can.

Now i know a good RP mindset entails not caring, and just not worrying about what she thinks. But this is more for MY sake in a way. I want my dick to be longer so i can actually do doggystyle sex.

I'd like to know your opinions, and if any of you have tried extending your penis? I just ordered bathmate.