Too long penis

I made Penis enlargement for some month. And it really became longer. And I read thunders place´s post´s, but still don´t know how the length of a penis is measured.
Now I have a new girlfriend in an other country and when flying to her there is always much sex with her. She says that my penis is too long for her and she can get pain on the end of her ?? (Don´t know the name) inside.
She never had an orgasm in her life. And when having sex, she did not become wet, so that lubrication was necessary.
So I thought it must be best, to start very slowly with her. And now it´s already a little bit easier for her to get wet.

She says I have a big penis and I am very strong. But I really don´t know how penis - length is measured.

Can somebody help me?

Greetings homer22

A ruler.

Take a ruler, place it along the top of the penis, barely touching the base. This is NON-bone pressed length.

Do the same as above but push the ruler into your body as far as you can, this is bone-pressed length, which is the only accurate way to track gains.