Car stopped shifting while driving! PLEASE HELP

I have a 94 corsica it is a v6, its a 3.1 I think. Today while driving all of the sudden I could not go anywhere. I put the gas peddle all the way down and the engine reved, but the car still would not move, like I had put the car in park or nutral. I had to push my car to the side of the road. When I came back to get it later, the car went for about 100 yards then the same thing. I checked the transmisson fluid and all was good. I heard no noises or felt anyslipping prior to this. It was just all of the sudden. Does it sound like my transmission is bad or could it be something else? Any clues? Thank you for any help.

I am not a transmisson expert, but have had cars fail before. Sounds bad, especially if it happened while driving. Need to get it to a tranny shop. you might get lucky but sounds like at least an overhaul is in order. When my son's 91 was acting up a little I contacted a local fellow who said he could do that from 400-750 dollars unless totally shot. Much higher if so. Maybe others will advise options but if nothing is working in any gear I would suspect a major problem.