trim the motor up and grab the lower unit, pull back and see if you get any unusual movement, if the motor mounts are shot, it will make noise like that. If it is jumping in and out of gear(feels like you hit a log), adjust your shift cables before any damage is done. When adjusting the cables do it with the engine running. Think about the shifter being a clock, neutral is 12, you want fwd in by 10, reverse somewhere around 2 o'clock, get fwd in as soon as you can, without it grinding before going in reverse. Try to keep it balanced, but if you have to favor one or the other, give fwd the bias
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