What size continuation bet are you making? Maybe it's too low... if not I honestly don't believe it is being called "most of the time". Should be at least 1/2 PS, I find 3/4 works best but mix it up dependent on the texture of the flop. Most flops miss most hands. Also are you giving up if you get called? That's fine sometimes, but if all you do is bet, get called and give it up players will spot that and call the flop just to see what you do on the turn.

Playing touneys or ring - what stakes?