switch classes to recon and put your spawn somewhere.
sounds like your MP team sucks.
I've played before with a team that was ALL assault. I was the only Support.
We were getting over-run, and no one would switch classes.
sometimes though, you'll find a great MP team/match with randoms. I've had some awesome games when people actually understand the concept and don't treat it like COD etc. The best is when you get a good group of randoms, and people stay online for hours.