97 Monte Carlo LS..... Tranny problem.. HELP!!!

i was driving my Monte Carlo and suddenly i accelerate and it seems like im on Neutral but its on Drive..... so i pull over and check the tranny fluid and its full.... doesn't look or smell burnt...... BUT i have NO Reverse, and any Drive gears..... i put it in gear and it feel like its on Park or Neutral..... It doesn't move at all.... NEED HELP....

is it something electrical with the tranny.... or is tranny gone??? it has 122,000 miles on it

ALSO...... its has a check engine soon...

This is an internaL problem assuming the axles arent broken, get it to a trnas shop.