I suggest you get into a deep conversation with someone then.

About something that deeply interests them.

Once you've gotten to know them a little better, you'll develop a friend, with whom you can share the sort of things you wish to talk about in exchange for listening to what they have to say.

Start small. Listen to someone, and give them comfort. You will find that over time, you might start to find that it's just as good to listen as it is to speak out.

As for an immediate outlet...hmm...what about a political forum? There's several of those around. Or you could try posting on other political blogs to get yourself disseminated a little faster. Try a few of these things, and see if any of it works.