Is this just me or is it a disorder. I stay up normally till 2 on school nights and study. Is this normal?

We're all different. You're an "owl". Some people can't function late at night - others get their best work done in the wee hours when there are no distractions and they're awake and alert. Whatever works for you. Just try to get a full night's sleep - 8 hours - so you don't run out of gas.