That's good, 'cause Boston is unofficially known as the "Attitude Capitol of the World" - like that's a good thing.
I had an e-pal who went to UMass-Boston and was in the Gay fraternity - not a contradiction in terms, it's out there for real. Delta Lambda Phi has a local "colony," in other words you can join no matter which college you attend. They work hard to not be stereotypical, for instance they have an anti-hookup rule so nobody can assume guys pledge just to get other members into bed. And you can't call their theme parties stereotypical since every frat under the sun has those - except the themes are probably different now and then.
Sometimes there's nothing like knowing other Gay/bi/curious guys only as friends, and this seems to be a pretty good way.
The scene HAS changed a lot since craigslist and all the other "usual" social/personals Websites have caught on. But that's only in terms of finding hookups and maybe serious dates. There are definitely lots and lots of organizations in town, but the down side is that you'll be relentlessly and not always subtly hit on if you take part. Accept the age-based flattery for what it is, and enjoy the ability to be choosy. Campus-based gay groups have become a lot less relevant as social outlets, but even in the best of times the membership did lean a lot towards the "activist" and "club kid" types.
Boston - and the surrounding cities - are way ahead of a lot of the country in terms of accepting "people like us" without major problems. It's not like a loud convo will suddenly turn dead silent when you out yourself; more likely, the response will be, "Yeah, and...?" But homophobia's far from dead here all the same. So take reasonable precautions, like when you walk in a weight room and find half the football team there.