Best advice I can give you is, don't try to fit in. Even before transitioning, once I stopped, I felt heaps better. If you don't find the jokes funny, don't laugh, or just politely smile. Act yourself, simply. People will stop seeing you as a "real guy", and as thus will stop expecting "real guy" stuff from you. And as a bonus, people will accept you better if/when you come out and transition.
Honestly I went to school this term as a girl for the first time this term, did the announcement to everyone, and poof, it was done. I'm happier, and honestly people haven't had trouble adapting to me at all. For real. No questions, no awkwardness, everything is just as before, possibly better.
I think transitioning actually made things easier on them, because I think I was a bit beyond the normal limit for a girly guy. One of my teammates for the project who I'd known for the whole two years (like almost every classmate - it's not a big program), last spring, before I came out, accidentally called me she like 3 times, and a teacher did it once too.
And the biggest problems I ever got with being a "girly guy" was maybe four occasions where people whispered about me, debating my gender, and once, it was like "People don't care about you being different. See that one for example. It's actually a guy." - "Oh, I see."
Really, unless you live in some really weird environment where people throw rocks at boyish girls and girly boys (or are above maybe 40, which is the age when adults start having that excessive confidence that basically freezes their beliefs and makes them strict, sometimes in the way they were raised several decades ago), there's absolutely no point in not being yourself.