No, you are being unreasonable and immature.
Getting married means that if you find that living with your partner is impossible, you're then legally tied to that person. So fixing the mess when it turns out you're not actually compatible long term will be a nightmare.
Move out to your own place.
Then live with someone.
Then get married.
Why is there any rush to marry this woman if you're not going to live with her until you've got your own place? Surely save up, get the place, then marry.
There is also a lot to be said for living on your own first - particularly as you're coming out of living in a very controlling environment with your parents. You need to know you can actually manage a home by yourself I think.
If you were not living with them, then I don't think theres any need to tell your parents.
However you are, and you intend to keep living with them, presumably very cheaply so you can save up - knowing that if they knew you were married they'd probably kick you out.
Regardless of their unpleasant and ignorant beliefs, being a liar is not great either!