The Reasons why you shouldn't get married:
1. You've never met in person, you don't know if you have a face to face chemistry together which is neccessary to make a real relationship work
2. You live in two seperate countries i.e. you are not part of each other's physical world, that world is unknown and alien to you two and you will not know what it's like until you actually meet and experience it together. Can you share that physical world together? Who knows, but for now you are completely oblivious to it
3. One of you will have to make a painful decision to move country and abandon all of their family, work, study, friends, everything built up in your life for the sake of the other. Who will be willing to make such a step? Such a humongous leap of faith
4. Both of you will be extremely busy with other commitments shortly and will have virtually no time to dedicate to one another. How do you expect to sustain your relationship under these circumstances?
5. Your friends and family aren't aware of the idea. They should be the first ones you turn to for advice. Don't even think about doing this without their approval, the alientation they will make you feel as a result of this will be very taxing.
There are a lot of other reasons why you shouldn't do this, until at least a lot more is set in place. I think you are entertaining this idea because you are still very young and you have a very rosy idea of marriage. After you think about this a bit more and talk it over with family and friends you will quickly realize how unrealistic this idea is at this stage.
Hope this helps
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~