No, that would be by genus, you have to confess grave sins by species. Please consult with a priest about how you actually need to confess sins, but I think he could say "I entered an unnecessary proximate occasion of sin one time for X hours and encouraged my family to do likewise and I did one impure look which also scandalized my family and anyone in earshot because someone in my family urged me to look at that person and I commented on them."
Please find a priest loyal to the magisterium, and ask him whether it is necessary to confess in this fashion. Also describe to him how you feel the need to make a six-hour confession that is so long it would have to be written out into a very lengthy document, when other people don't feel the need to do so. One other thing you might do (and I strongly advise against self-diagnosis in such matters, you need that priest to guide you), is to ask yourself the question
"if my way of thinking is not scrupulosity, then what exactly would constitute scrupulosity?". There is also the very real danger of thinking "I'm the only person in the world who is right about moral matters, nobody else in the Church thinks correctly". Not saying that you are doing this, but the danger is there. Ask yourself "who in the Church would agree with me?". Just a thought.
I will, however, for lack of a better way to put it, "take your side" on one thing, at least up to a point. Contemporary women's beachwear is indeed a controversial topic among more serious Catholics, and opinions vary. In past times it would have been considered to be basically nudity. Our society has become so desensitized to such things, that few people give it a second thought, but religious groups more concerned with traditional concepts of modesty (Muslims, Orthodox Jews who keep
tznius standards of modesty, some fundamentalist Christians) have adopted very demure swimsuits for women, and in the case of
tznius fashion, they are not unattractive outfits, so a woman going to the beach doesn't have to look dowdy or frumpy as though she's living in the 19th century. If you want to adhere in your sensibilities to such standards, I can't say that you're wrong, just that your thoughts tend towards the more conservative end of the spectrum. If you discern that going to a mixed beach would be an occasion of sin for you, don't go. Nobody
has to go to a beach.
EDITED TO ADD: What I mean to say here...
In past times it would have been considered to be basically nudity. Our society has become so desensitized to such things, that few people give it a second thought...
...is that, for good or for ill, such things as a two-piece women's swimsuit, something that makes certain aspects of the female anatomy very obvious, is no longer considered
per se immodest or sexually arousing by the vast majority of people, and our society has come to take the same attitude towards such beachwear, as some indigenous peoples throughout the world take to bared breasts and loincloths. Add to this, and there's no delicate way to put this, but not all women look particularly fetching in such beachwear. Moreover (and some of this is just my own tastes), the simple, winsome, unadorned, well-toned beauty of (let's say) women in the 1970s and 1980s --- for a man of my age cohort (mid-sixties), Farrah Fawcett and Cheryl Tiegs come immediately to mind --- has been replaced by all this business of exaggerated features (lip fillers and so on), tattoos, bizarre hair colors, and the like, and the end result is kind of cartoonish and even grotesque. Long story short, standards of beauty have become kind of primitive (that's the only word I can think of), and society at large has become numb to what in earlier times would have been considered horribly immodest. If such displays cause problems for any individual male, all I can say, is to stay away from places such as mixed-bathing venues.
