A troll is either a small repulsive creature who lives under a bridge, or an Internet entity created for the purpose of antagonism and instigation. The later is common here among the left, since this board has no limit on the number of 'identities' someone can create. You see, the strategy is this; one liberal pinhead, can create dozens of 'trolls' to post under, making it seem as if the leftist view is much more prevalent than it really is. This is much more common for the left, because liberals tend to be more 'mission' oriented. Conservatives aren't interested in a 'mission' as much as simply articulating and arguing from a conservative point of view. Conservatives don't find themselves frustrated by the fact that most people aren't conservative, because most people are. It is the liberal who feels the need to puff up their numbers, by creating new identities, and adding a certain element of 'support' for whatever liberal idiocy they are trying to peddle. It has become such a popular trend among liberals, newcomers are often mistaken for 'trolls' here, and that's something I guess you'll just have to deal with.
My suggestion would be, just keep posting and try to make your points substantive and keep your arguments legitimate. In time, you will come to be known by your style and manner of posting, and the accusations of 'trolldom' will subside. Then you'll just be called a liberal pinhead and mocked accordingly, which will probably cause you to change your name and come back again as a new identity, to attempt to start over. This practice is common as well, among liberals.