Emma, I'm a noob here, too. I have a little advice, if you want it.
The folks here are used to DU operatives coming here pretending to be conservatives. These same operatives will set up situations and threads with the intent of making us look really bad. Back when Protest Warrior was alive and well, they did it all the time. They'd post something ultra conservative, get a few ultra conservative responses, then post on DU about how militant we were. I'm sure some folks here do the same thing on DU. It's just a natural internet cycle between conservatives and liberals.
But, because of this cycle, it makes people paranoid. You can't come here and immediately expect people to accept you as one of them. Every new member is viewed through jaded eyes because of the constant planting of moles on forums. Just be yourself and eventually you'll find your place here, same as I will. And remember, if people still don't like you, it's just the internet....does it really matter that much in the grand scheme of your life?