So a month ago now I got into my first real boyfriend/girlfriend relationship in about a year. I'm six foot four and she's a foot shorter than me, which hasn't been too big a problem when it comes to sex but my penis is 8 inches long and about 6 inches around and she has a rather petite vagina. I've never been with a girl as tight as her and she feels spectacular, but I've been unable to hold back from cumming long enough to give her the mind-blowing sex she deserves. I'm not entirely convinced that the big penis/tight vagina thing is the source of my issues, but it's a likely culprit. My last girlfriend's vagina was definitely more on the big side and we were somehow able to control when we had orgasms, far different from my current situation. If any of you have experienced this and have any advice, It'd be greatly appreciated. I'm getting more and more frustrated to the point where I'm enjoying sex less due to a guilty conscience.