Wait, holy shit, did you just actually scream?
How to Deal With It:
Hey, you know what all that shuffling and visible discomfort and awkwardness makes you in the eyes of your fellow travelers?
Hint: it's this guy.
The creepiest part of the public transit experience is invariably the "spot the freak" game that you wind up playing whether you like it or not. There's a very specific set of unspoken rules to being in an enclosed space with your peers, and they all amount to one thing: be normal. The more nervous you get and the more the situation gives you anxiety, the more sweating/fidgeting/being anxious/outright yelling you are likely to do. Congratulations! You're now the freak no one wants to make eye contact with and everyone avoids like the plague.
Wait -- don't run off to the nearest subway system to go full C.H.U.D. just yet! You can also use your newfound status in the commuter caste system as a form of mental protection. Once you wrap your brain around the whole freak thing, you'll find you're essentially the King of Commute: instead of thinking everyone else is out to get you, you can now relish the knowledge that they're all doing their best to give you a wide berth. That sort of thinking can be a lifesaver in an overly crowded bus, and it doesn't even require you to actually poop your pants and pelt people with live ferrets -- just the idea of being that oddly scented fuck-you of a person everyone wants to steer clear of can offer plenty of mental protection.
Just remember to watch out for Frank the Stabby Hobo after 7 p.m. He's not too keen on competition.