Being too big for my partners happened to me as well, and probably to several others on this site. And vaginal sex is not always the main problem. Trouble with oral and/or anal sex can also be a problem in the long run as it gets frustrating for both partners that some options are banned in bed.
I’m more surprised about the « lasting too long » bit, as there are a lot of creative ways to pause, play differently, etc. I last long but never got that issue. Curious to see that others have, and will keep following this thread to get to understand more!