Exhaust smoke white
 

Hi, I hope someone can help, I have my Mazda 3 2009 A few times and have had A lot of white smoke come out the exhaust and feels like it's about to stall but then picks up slowly. This seems to happen when going up a hill or accelerating after traffic light take off. I had previously checked oil and topped. I did call Mazda once and was ssked if i had AC on, which I did, i don't often use it, he told me that mazda made the AC so that the condensation outlet was situated over the car exhaust and this may very well be the issue. I'm so worried that my car is going to blow up. The coolant is not at maximum but not low. The indicator on dash shows no overheating?
I had been driving the car for about 2 hours, going to shops then other shops. I live on Gold Coast Australia so not a cold climate.