I would like to say that the first time i saw my wife i thought she was the one but the reality is i didn't know her. I thought she was absolutly beautiful but that doesn't neccessarily make her the one. There wasn't a particular moment when i said this is it, i think it gradually happened.
When i met her, i had gotten out of a really really bad relationship and i had trust issues, so i was very skeptical and cautious in the begining and i told her as much. I do remember a time when she said "don't worry, i have enough faith for the both of us". I think that was a powerful and turning moment in our relationship.
We do come from very different backgrounds but we share a lot of the same values and interests. Relationships take a lot of work, don't let anyone else tell you different.
We've been together for 9 years, been married for 3. The one thing i can tell you is that make sure you 'like' her and the kind of person she is. I don't mean 'love', which i don't think you have much control over. You can fall in love with the wrong type of person, someone that's not good for you. I mean LIKE, someone who can be a good friend, someone you admire thier intelect and temperment. Someone who is committed, caring and isn't too self-centered.
With all that said, expect up and downs in your relationship. What matters is how you handle them together.