Jovan,
Double majoring … as my advisor told me and I saw his wisdom: “Unless you are absolutely sure you want to commit to two majors, you should rather take classes you’d like rather than committing to two majors.” (And sure, the easiest double majors are math+ something else, physics+something else, Course 21/15 + something else. That’s scary for non-MIT people, I know.)
You do have to satisfy the HASS requirement somehow (distribution, concentration, communication-intensives). AP humanities classes and maybe your coursework at Amherst might qualify as some of the HASS electives. The HASS classes are a hidden gem, plus you can always cross-register (to Wellesley, Harvard, MassArt). I thought my literature HASS classes were pretty intense reading-wise (like easily 200, 250 pages per week) but those prepared me for graduate work.
Social life really depends on what you make of it.
Frats, my general take is: around half of MIT men are involved with frats and they vastly vary. TEP is (and historically has been) very LGBT friendly.
There was a frat with International Science Olympiad medalists, which is NOT weird at MIT: Brothers | MIT ADPhi
And notice this is not your typical jock, Caucasian male, beer-guzzling, etc. stereotype.
Run all their names through Google with “olympiad” and you’ll be surprised. Johnny (Jiyang) Gao was even an absolute winner of the International Mathematical Olympiad.
I knew of one fraternity where one of the brothers put together a computer (calculating how to split the signal) and a 5x5 panel of large flat screen televisions and combined it into a mega screen.
The living groups have different vibes, different culture.
There are even living groups when I was there where open relationships were the norm. There are coed fraternities like Number Six Club. http://no6.mit.edu/
No, you won’t be hazed.
People socialize all across the board:
Sometimes through mutual classes,
Sometimes within the major,
Often within your dorm,
Often through clubs/activities and intramurals,
Sometimes in your study group,
etc.
I’m a borderline introvert (which means I’m an extrovert at MIT and my more introverted wife swears I’m extroverted) but I was very sociable and had friends from fraternities and lots of places. I lived at Fred (East Campus). I wasn’t a hacker type.
Parties wildly vary (and your mileage will vary). I’m sure you’ve seen videos of the rollercoasters done by East Campus or other things.