I bring him food I make sure he's happy. Some people really can't wait, others can, and there is nothing wrong with either of those. And for mormons, the goal is always a temple marriage and a marriage for the eternities. Joanna mentioned that our theology is rich with opportunities for second chances.
Make sure the girl you like is already 16 years old. And no I would not pressure them to convert but as a Latter-day Saint I would pray for them to convert as I do for many people I know and love. Though my mother never openly complained about this, I could see it in her eyes. Ignore the busy-bodies who want to condemn your significant other. If you feel peaceful with your decision and you feel it is right that should be helpful. I just returned from a difficult meeting with my psychotherapist and felt depressed-then I found this amazing blog. If so, you have a chance.