I'm a Christian who's struggled with porn since his mid-teens, I'm now in my second year of uni (having become a Christian in November of first year) and it feels like I'm finally making progress towards stopping (when I'm not relapsing that is). It's so so hard, well done for waking up to what an idol and prison it is so quickly.
Practically, I'd advise you to fill your time up as much as you can, keep in contact with lots of friends, Christian or otherwise. I find it's evenings when I have nothing on and I'm just studying in my room that the temptation is worst.
Spiritually, I'd say remember that God's love never fails, the end of Romans 8 is really edifying when you don't feel worthy of Him. All our anti-Biblical sexual urges are a desire for intimacy. We're feeling far from God so we try and get the feeling of His presence on our own, without success at all. When you are tempted, don't hide yourself from Him, cry out in your vulnerability, in the midst of that battle, and He'll come to your aid just as He promises. But only if we stop fighting in our own strength.
I'm *nowhere* near perfect at following my own advice, but when I do I find the above helps. When you feel crushed by guilt remember that Jesus was willing to die for that guilt. When you feel unworthy remember that Jesus knew how unworthy we are.
Satan is a liar, and a defeated one at that, so take heart sister.