You've be offered some incredibly good advice. Some have focused on your faith and relationship with God, and I could not agree with them more! Jesus absolutely must be the centerpeice of your marriage, He is the central foundation, not your relationship with your SO. Kari's advice was so true - do not be blinded to God's will because you are head over heels in love with someone. Sometimes it's really hard to hear God's voice telling you to leave or get out of a relationship because you are so attached to the idea of living life with your SO.
I'd like to focus on the practical side for a minute. You should ask yourself if you share the same interests.
If you like to get out and go hiking, camping and fishing, does she like those things too? Do you have a dream about your future and your profession? Will she support you and encourage you in those things, or does she feel like your career goal of a professional comic book artist is absurd (just an example

).
Are you an introspective, introverted person that needs peace and quiet and down time to collect your thoughts, or are you an extrovert that loves to party and entertain and spend all your free time in the company of others? And is she tolerant of that? Sometimes we make sacrifices in our personalities to be with someone, but I'm telling you those sacrifices are easier to make while you are dating and engaged. It's when you live together those differences can become real stumbling blocks. Or strengths, depending on how you look at them.
What about your future goals in life - where you want to live? Is living in suburbia with two SUVs and a big house ok with the both of you? Or does one of you long to live in the quiet countryside and the other in the big city? Where you want to live often says something about your personalities and the way you expect to live life together. Just be careful. I've found that women often have dreams about where they want to live and how ther lifestyle is going to be, and then the guy never expected to have to meet some of those requirements like a $400K house. Do i sound shallow? Maybe so, but I've seen it time and time again. What guy wouldn't want to provide for his wife in that way? But be realistic in how you dream of your future lives together.
How about finances? Once someone shows bad financial tendencies, like freely spending money they don't have, it's very hard to break that habit. Does your SO have good financial habits? If they don't, make sure they do before you get married!
So, yes, I completely agree with EVERYTHING the CFers above said. But I want to encourage you to pick someone who you can really share life with. Common interests, or the willingness to explore new things your SO is interested in, are such key things yet they are often overlooked when you are totally on fire for someone. And they don't seem like such big deals when you are courting, but sometimes your desires about life stick with you, and it becomes a problem later in life.
If you actively pray for God to bring your SO into your life, He will. Sometimes it doesn't happen immediately. Sometimes God needs to prepare your heart and change your outlook on life and strengthen your resolve. Any relationship can work - if you have the fortitude to work through your differences. It's so true when people say opposites attract. But nobody ever tells you how difficult it can be to marry an exact opposite of yourself! Just take a look and make sure you share at least a few common intersts. I've found that those things often become anchors in a relationship to help you through the rough times.