Another thing to consider is that there's a lot of societal conditioning that points to dominant behavior and says "bad!". Even an intellectual understanding that the acts are consensual and an inner tendency to desire these things sometimes can't overcome the feeling that you're somehow doing something "wrong".

That may not be coming into play here, but I've seen often enough with new dominants. Overcoming that just requires patience and reassurance -- and being active in a community like this can help. The constant reenforcement that you're not alone and you're not doing anything wrong and all these other really cool people do it too is helpful.