Cannot Start Program Without Debug

I use a simple delay clock code. But whenever I use this code program won't start without entering debug mode in KEIL. I plug stlink out and reconnect but it wont work if I don't enter the debug mode. Is there any solution to this. If not then what else can I use to have 100 us delay. Thank you for reading

			      uint32_t startTick = DWT->CYCCNT,
             delayTicks = 100 * (SystemCoreClock/1000000);

       while (DWT->CYCCNT - startTick < delayTicks);