Bigger may not always be better

So I have had sex with guys with penises anywhere from 5 in. to 10 in. and I have found that when it gets past 8 1/2 or 9 inches it's just too much. I feel like I may be alone in this. I have actually found my g-spot and its lower so I think this may be why 7 1/2 inches (aprox) is my perfect size. I've always been under the impression that most people think bigger is better, so what are your opinions?