You can stop paying them by not engaging in a taxed activity.
You next act can you do the same to me. No. You were never given consent to do this.
Your next point is going to be "I never gave consent". No, but society did and we do make social contracts. If we were to take this line of thinking then every law is invalid unless agreed upon by 100% of the people. The people of the United States gave some powers to a government. Most of these happened before you are born. So either you think all those powers are not legitimate thus making you an anarchist or you believe in the concept of social contracts such as our constitution. If you do not believe in social contracts you are free to leave this country and find a place more towards your liking.
What makes it different than a robber? One is consented the other is not.