For me, my perspective was that since betrothals were like marriage in the Old Testament, if I were going to propose to my wife, I wanted to be completely convinced and settled on the issue before I did it. I know not everyone takes that approach, but that was mine personally. If I were going to ask her father to marry her, I already had to be sure of it. So I settled the issue with God in prayer before I proposed. It was a good thing I had resolve. It was hard to marry someone from her people-group.
When I came back from the trip to meet her parents, I was confused and conflicted. They'd planned the wedding in a language I did not know. I wasn't doubting whether to marry her, though, but about how it was going to happen, and it turned out okay after some struggles and trials with extended family issues.
What are you afraid of actually? Do you think you would be afraid no matter what? Do you think she's not a good match.
Having a lot in common is highly overrated. My wife loves to cook. I don't. But I like to eat. We don't really have that in common, but it works out okay. If your wife likes to do extreme couponing and you don't, does that matter? If you play golf while she does needlepoint, does that matter?
What matters is that you have faith and values in common. You also want to have a philosophy on marriage in common. My wife and I had very similar beliefs on faith. We came from a similar church background, in spite of the fact that we were from opposite time zones. We had a general agreement on the husband and wife's role in marriage, at least on a theoretical level. A lot of things you don't know much about until you do them.
Something else to keep in mind is that you are to love your wife as Christ loved the church. People have gotten married in different ways throughout history. Some got married through arranged marriages sight unseen. Some were set up by their parents with someone in the community they grew up in. In modern times, a lot of us found someone and dated. However you met, a husband must love his wife. The wife is to reverence her husband and submit to him in everything. Marriage is to express something of the mystery of Christ and the church. If you are going to marry this woman, love her and commit to her and resolve to be committed in your decision. If you do decide to marry her, you should not allow yourself to waiver in your commitment at all. It's a waste of time and emotion to sit around thinking you should not have gotten married.