In the spirit of controlling the controllables, you can’t dictate the amount of success you get from cold calls.  So focus on activity – commit to running a certain number of calls.  If everyone rejects you, give yourself a pat on the back and a small reward – you’ve managed to get a load of “no’s” out of the way.  If you get some success in an early call, make the remainder and don’t stop until they’re done.  Focusing on activity is more manageable and in the long term you’ll get more done – the more calls you make, the more success you’ll see.