My dear, I know something about the need to please/obey your parents but I don't believe in blindly doing everything they ask. They believe(rightly or wrongly) they know what's best for you and they have chosen to ignore/dismiss your concerns about this marriage. The question is, will you ignore/dismiss your own concerns too? It does not sound like you want to do that.
If you do not see a future with this man, there is no need to go through sponsorship, even if it is a terribly put application. You may think it is easier that way, but if you do what you are planning, you will just be prolonging the inevitable and your stress levels will be high. You could also jeopardise your chances of sponsoring a man you truly love later on.
As for your parents, are they here in Canada or Pakistan? If they are in Canada, have you thought about moving out and living on your own? Distance can be helpful in such situations. If they are in Pakistan, have you considered limiting your phone calls/emails with them? It's very important to communicate with your parents, tell them truthfully where you stand, what you would like from them, and what you would have no choice but to do if they continue the behavior.
I can tell you from experience, no amount of doing everything they want will establish the necessary boundaries or make them respect you/your feelings. You need to stand up for yourself in a respectful yet firm manner. Create those boundaries, re-enforce them each time and maintain them. If you don't do that, they will also decide when you can begin having children and how many you should have.
Unfortunately, you have already gone a step further by marrying someone you do not want to be with. But it's not too late to turn things around.
It is time my dear, to think carefully, take a stand and decide once and for all what you will do. Once you decide, also make a choice to not change your decision, no matter what. Once your parents realise none of the pressure is working, they will decide to leave you alone and accept things as they are.
About honor, I do not understand the concept per se. Everyday, we(humans) dishonor God/Allah/Buddha etc through our wrongdoings, yet God forgives us each time we repent and ask for His mercy. Who then are we(humans) to demand other humans to "honor" us(family) and even think we are in any position to punish them person? How about your parents allow you to discuss this "honor" business with your God? I'm sorry you are going through this, but I hope this helps you.