When you are planning a wedding, it should be with someone you really, really love. Someone with whom you want to spend your future. Want to start a family, want to stay until the day you die.
If it is not the case, you should probably back off. The sooner the better. Seriously. Do not force yourself into anything. Just check out these confessions of people who called off their weddings. Most of them feel relieved. Perhaps, they just have not found that person for them, because when it is real, you will want that to happen. No matter what. So good luck with your search!