My cars coolant keeps going down in like one drive idk what is wrong with it.

If you can't find any visible leaks, then you have an internal coolant leak. This is either a blown or leaking head gasket or cracked head or block. Do you notice any white smoke or sweet-smelling vapor coming from the tailpipe? I would take it to a reputable mechanic to have a compression or leak down test done, to see which problem it is. It could also be a leak at the intake manifold or water pump, but I would definitely have it diagnosed, after you check well for visible leaks. There is also a dye you can get at the parts store that you put into the radiator, and it will show up where your leak is, to make the leak easier to find. And if it changes your tailpipe exhaust to the same color as the dye, then you know it's a combustion leak - which is either a blown head gasket, or cracked head or block. I would do this test first, and if you don't find any visible leaks, then take it to have a leak down test to determine where the problem lies.