If its a FL you are visiting, just make sure you leave a happy man and got what you wanted from the session, doesn’t matter your dick big or small. After all, you are paying for the service.
If its a life-long partner we are talking about, she should be loving you for who you are, again doesn’t matter your dick big or small. Find the balance both enjoy, make up with foreplay, painting skills, etc, etc. You will still be a happy man