1996 contour GL 2.0

Replaced heater hose
drained the cooling system
replaced cooling temp sensor
water pump is good

my car is having overheating problem, It having hard time starting, and when it does lots of white smoke comming out of the exhaust pipe, my system runs cool for like 15 mins of driving where then it starts to reach red peak. My heater works first 15 minutes and then when car starts to over heat it dies (NO HEAT) .
did anyone had to go through this b4 or something similar? let me know please its my second day tryin gto figure out whast the problem. Now im beginning to think its the blown head gasket and leaking antifreeze or it just burns it out through exhaust pipe. thanks guys


1996 GL 2.0 16V Zetec DOHC AIM s/n- DJWhiterussian