Well 1rst you start by stopping watching porn. This is the biggest problem for men, and I know because I suffered from it AND I am also Bi and could see how fucking delusional and waaaaay out of touch men largely are. And by being Bi and largely preferring women, I noticed it was easy for me that so many dudes are so out of touch as all I had to do with women was to ask what they like and to also pleasure them in return and... I actually end up having really good moments pretty much everytime because I stopped comparing my dick size to others and just focus on the moment.
I'm about 5 inches, which is below average but I get rock hard and can fuck for a while, is clean, smell good, is present in the moment, good kisser (above and below) and don't treat women like crap. Which apprently isn't that common so lucky me.
And, again, being Bi got me both perspectives from Women and Men and what came up a lot and both complimenting me on, was how actually hard I was. So better start hitting the gym, stop eating trash, stop porn, and so on.
Seeing escorts really opened my eyes and made me more confident in general and women in my day to day like work noticed and made direct comment on how more at ease with myself I was. Because, in part, I stopped worrying about how big or long my dick was.
And so should you.