I have antifreeze in my oil 1994 pontiac grand am

You have bad head gaskets! one of them is leaking at the coolant port into the oil port. If you are mechanically inclined you can fix it yourself with alittle bit of know how, or you can have someone elts do it for you. Its also in the best intrest of the vehicle to not drive it anymore until the repairs are made- Thank you for using fixya.com

You most likely have a blown head gasket. You will only know more by either disassembling the engine or having a professional shop look at it. If you're determined to look further yourself - without starting the car - crank it over [ remove the spark plug wires - making them plainly with tape - -- ] after removing the sparkplug wires from the sparkplugs - crank the engine over for 30 seconds or so and then pull each plug - look for moisture on the plug end. If there is moisture then you have internal engine problems.
Remove the heads and have a look to see if they're cracked - replace head gaskets. You should be ok if you have the heads checked and do a visual inspection of the block.
Best of it.

If you have a 3.1 it is more than likely that the intake gaskets are bad.Hope this helps.Good luck.