Perhaps you are feeling lonely right now, and that you currently
believe that having someone by your side whenever you want her to
be, would be a better thing.
Feelings come and go, and it messes up our thoughts real bad that
sometimes we tend to choose decisions that are not of our interests
when we are feeling okay. Perhaps you should give it a few more
days or weeks to think it over, maybe the feelings of wanting to
get married may only last for a few weeks, and then after that, you
don't want it anymore?
Cheer up!