Hey don't feel bad. I ruined a cometic head gasket by putting it on backwards. There is an up side and a downside. Most gaskets say it on them. The holes for the water passages and oil passages probably aren't lined up right and it's making the fluids leak into each other. Are you sure that its coming out of the oil pan gasket though? You could have a leak from a hose or something and it's just pouring down there making it look like it's coming out of there. It should be leaking oil too though if it was the oil pan gasket. I think it may be as simple as a hose or like spec r said the gasket for the water pump itself. Pull the dipstick out and if there is water in the oil then it's the head gasket. If not your leak is coming from somewhere else and draining onto the oil pan.