I joined a sorority at a major state university. My mom was in one and a nice southern debutant girl (well sort of , mom never made her grades at the same major university and was never initiated, transferred schools and then got married before graduating...never tried to join at the second university, she was initiated as an alumnae later.)
I forget how many sororities were on campus...maybe a dozen 8 of them were Barbie-esque....2 of them were what I would have to describe as normal real women. Women of a variety of sizes and attractiveness but smart, clever and caring women...not fake at all. And two were somewhere in the middle with a mix of barbies and non barbies.
I really thought I was a shoe in at two Barbie sororities and had my heart set on them even though I am/was not the least bit Barbie. I ended up in a real woman sorority and loved the experience.but I was somewhat crushed to find out I wasn't up to Barbie standards. I would have been miserable if I had actually gotten into my mom's.
That said...at my university the sororities never had actual parties at their houses as in any kind of get together other than rush activities or a founders' day luncheon and no alcohol was permitted on the property. I mean you could host meetings or a holiday party...but non alcoholic. All true partying was done at the frat houses.
Rush activities are a special kind of hell that I wouldn't say were "parties". The were in the day time and the first set were like 15 minutes long and you could only serve water, the next set were a bit longer, the next set was a bit longer and was skit day, another day were really long and you could serve a snack and drink (within the rules).
My suggestion would be to google several of the soroities found on your campus like this
Name of sorority name of university by laws
The by laws will give you an indication of requirements and a peek into sorority world...like one I saw online had an elaborate points system for attending certain things and if you failed to meet the points minimum you had to appear before the committee. The have study hours...when I was in my sorority you had to track them in a type of study hall thing...if you had a good gpa you weren't required to track and turn them in.