The Colombian is currently on-loan at Aberdeen and comes off contract at City in June.
Gonzalez told the Daily Star Sunday: "Yes, you can say my whole world has changed big time. I had been playing for City reserves in front of 500 people and last weekend I played in front of 50,000 at Rangers.
"It's a dramatic change for me. I'm having a great time. My football is good and there's another baby on the way, my second child.
"It just shows you how football and life in general can change from one day to another. I just want to keep playing every week and then we will see what happens.
"The main thing when they produced that DVD for City was to get to be known. We're not there yet.
"I would still say I need to put in good performances in the next couple of months for Aberdeen.
"I need to keep some clean sheets against big teams. Show myself. My expectations would then be to come back to England.
"I would love to be No.1 at a Championship club or fight for my place in the Premier League. That's my goal.
"But right now I'm just thinking about Aberdeen, trying to be as good as I can and showing the Scottish public what I'm capable of. I'm loving it here in Scotland."