Before you start drilling be sure to fully tighten the bit in the drill chuck and make sure it’s straight or you’ll quickly break the bit. The quickest way to check if it’s straight is to run the drill without drilling a hole. The bit should stay straight as it spins and not wobble or turn into a blurry cone. If you’re sure it’s chucked right, the bit might be bent and should be discarded.
Let the tool do most of the work, applying steady pressure directly parallel to the bit. If you’re leaning into it and nothing happens either the bit is dull or you’re using the wrong kind for your material.