Getting away from the Dock in High Wind

[allstar1976]

I'm new to sailing and made a bad decision to take friends out, just for a motor around the harbour. My slip is at the end of the dock at the furthes point out, i just had to push off the bow and go forward.. Well it didnt' work I have a Tanzer 22 with a 7.5hp motor... as soon as we untied the motor had no power and wouldn't move us we just drifted backwards... I thought at the time their must be something wrong with the motor.We got towed back to the slip and I tested the motor and the propeller seemed to work fine.. I know it's a small motor but shouldn't it have gotten me out of their? i should mention there was a 20 knot wind that day..