With my experiences and sum rejections the answer is yes.
Not so much the girth and by length and only to deep ...brings discomfort to both the female and me many times.
I'm will to say many female don't want to handle an dick above 8 inches thrusting up in them pounding and thrusting deep.
My dick even bends and it feels like I'm hittin against a brick wall with my head. You will have much meat left out of the action too.
On the real size being honest it ain't always a blessing to be truely hung with 10-12 inches inspite of what some folk say and how some pron shows.
All you have to do is look close, man we never get our dick all the way balls deep hung this way.
And on top on this, on the real...sometimes we can't keep our size dick up with a good total rock hard on for a long time. it takes more blood for us.
So your GF may just be right. Who are you actually tryin to please her or other folks who like oversized peters and making comments and jokes about you being so damn large, always staring between yours, lookin at you like some circus freak.
Man, many ain't gonna share all the down sides to being large/long.
Hell you can even sit down on a toilet without holding your dick up from the water!
From the looks of your pic, you have a great size dick, be happy esp if it's in all good working order.
One dangerous side effect from pumpin can cause blood clotting the tissues or vital arteries and veins in the penis. I know you don't want this to happen!