How can I deal w/workplace demands to be "team player" when I march to different drummer?

I'm currently between jobs, also hoping to transition to more of a freelance "bohemian artist" creative lifestyle. I keep running into this problem in jobs where I am just not really the "team player" type that workplaces desire in an employee. I try to be friendly and cooperative, but I think outside the box, I get annoyed by interruptions when hyperfocusing (and yes, I get grumpy if there are too many). I like having other people nearby, but I prefer to have my own work to do, to not be micromanaged, and to go from start to finish on my tasks by myself as much as is feasible. I will ask for help if I need it and I am willing to give help -- if not interrupted too often. I know the people who interrupt me are not trying to ruin my day and I feel really bad about how I sometimes snap at them before I realize what I'm doing. I will probably have to have regular "day jobs" in addition to freelancing, so I want to at least APPEAR to be one of those who can "work well in groups," as the grade-school report card lingo puts it. Any suggestions?