By this site's standards I'm not very big at 6" long x 5 1/4 girth. How I feel has always been based on how my lover feels. My first sexual partner thought my girth was perfect. She'd already had two kids and every time we'd fuck she'd tell me how incredible it felt to feel stretched. With no reference or other experience it was a confidence booster, although I'd seen porn with much longer cocks.
My girlfriend after her couldn't take me without really being turned on and going excruciatingly slowly. She said it hurt to take me inside of her, and that wore on me. After a while sex was mostly 69 with me eating and fingering her because she wasn't comfortable fucking. That bothered me. I felt kind of like a freak even though I knew "regular guys" in porn were bigger.
My wife (then girlfriend) never said a word until I noticed she was crying during sex one night. I wasn't her first and she loved to fuck. She felt ashamed and embarrassed that she couldn't take me, and I felt horrible that sex was painful for the women I desperately wanted to please in bed. She also really loved to suck cock, but her jaw would become very sore after only a few moments.
On top of causing these ladies pain, the tightness almost always made me pop much too soon so I had that to deal with too. I definitely would have traded my cock in on a smaller model back then.
My wife eventually managed to tolerate me, even though there were a lot of times I could tell it hurt her. To add insult to injury sucking my cock for more than a few moments at a time still hurts her jaw to this day. After two kids she loves the way I fit her, even if the friction still sometimes makes me lose control too soon.
Maybe the women who chose to have sex with me were just naturally tight, but frankly I don't know how you guys hung bigger than me manage to have satisfying sex lives. I found it kind of depressing -- and I am not very big.
The silver lining is that my wife loves fucking again and loves my size now, so I have a little swagger in my step again