Love is something you should definitely feel especially the first years of marriage because its going to be hard to get used to each other so the feeling that love causes sometimes will be the only thing that will keep you pushing forward in trying to make things work... Sex is very important too in these first years and love is going to feel more like a passionate strong feeling
However after a while marriage turns into a relationship of complicity and being comfortable with each other. You just like to share your life with that person and it doesnt feel the same way with anybody else. Love is not associated with passion anymore, you still feel it but its a more peaceful feeling, it doesnt feel so strong it just feels very comfortable
Im not old enough to know what love feels like when you are very old but looking at old people I think love becomes something even more peaceful than in the other previous stages, I think it becomes more like a frienship, the most important friendship of your life. You really become life partners in every sense of the word.
With everything I wrote what I mean to say is YOU probably have an idea of what love is that will change throughout your live, in reality love is just a feeling that can feel for your parents, for your dog, for a good friend.... love is not these gigantic thing that you think it is. At this point in your life love is more associated with passion, and you should definitely feel that, but keep in mind that will change, you will change and so does she. Think if this person still makes for a good partner if you take the passion out as well, because if you are thinking of her long term, you will get there and the relationship has to work without passion as well.
Most people are not mature enough to understand what marriage is, thats why people are so fast to say is shit, it doesnt work and bla bla bla... marriage works but you are probably wrong about what it means and the idea that you associate with love when you are young will change, but you dont understand that yet. Only that idea of love as passion will not be enough to sustain a life relationship like marriage is.... good luck bud!