I have a Mariner 9.9 on my 14 ft aluminum flat bottom. When I was coming in to the dock last weekend, I moved the throttle to the shift point and shifted into reverse in order to stop(I was already going very slow, basically idle). When I did so, the engine stalled and it was very hard to move the shift lever. I tried to get it into neutral but it went into forward and is stuck there. I can not get it back into neutral. Is there something seriously wrong with my lower unit? Thanks.

Nathan