There are some groups on this site for christian discussion.
http://forums.psychcentral.com/jesus-feet/ You have to join the group to post in their forum, it says how to do that at the top of the page I have linked.
I'm sorry you are suffering from depression at what should be an interesting and exciting time of your life. I've often felt like giving up my job because of depression, but over the years I've discovered it is best not to make important decisions when in the depths of a depression because my judgement gets so clouded. I just try to take things day by day and hope that the answers find me, rather than me looking for the answers. Try to find little things that give you hope and reassurance, that might be as simple as a sunny day or a flower growing in an unexpected place.