I'd agree with the folk suggesting you live together for at least a year first, whilst also holding down full time jobs. That's what most of your life is going to be like, so you should know what that feels like before making that kind of commitment.
To be practical, the commitment is more about the money since weddings are expensive and divorce is just a bit of hassle (unless kids or mortgage are involved).
I remember my dad saying he regretted having not done a different degree in his 20s. I love him and I know he didn't mean anything by it, but it did feel like he was saying he regretted having the life that ended up with me in it.
Since then I've tried never to regret a decision, but still to learn from mistakes.