is this my head gasket? on 1990 BMW 525i

my antifreeze is coming out my exhaust...

Asked by for the 1990 BMW 525i
Very likely. Get it diagnosed by a BMW expert, ASAP. Tow it, don't drive it. Coolant in the exhaust stream indicates that coolant is getting into the combustion and will ruin the engine real quick.
If you want to find a specialist, here's a directory link for you: