I do? What's different about conscience?
If conscience reduces to my own beliefs, why can't I change it?
The conscience is the part of your mind that actively weighs the pros and cons of all your actions, keeping past experiences as a guide. As long as you realize the benefits of living in a secure society, and the importance of the reciprocity of good that is the glue to all productive societies, your conscience will weigh against you trying to blindly follow your desires.
Making any sense?