geereg:
... whenever my motor starts, the interrupt will automatically trigger itself.
Well let's get the terminology right. The interrupt doesn't trigger itself.
You mean, when the motor starts, the interrupt is triggered. Therefore the motor triggers the interrupt.
the interrupt is an external interrupt hooked up through pin 3 with a pullup resisitor.
You don't hook interrupts up to pins. What is connected to the pin? A switch? Which goes to where?