Is it normal that i'm up all night and sleep all day?

You can try exercising, say jogging or swimming three hours prior your 'bedtime'. After that, grab something light to eat. Your body needs energy to digest the food, so as reflex, it'll want to sleep it through to conserve energy. The exercising also wears you out.

Start changing the hours little by little to make a successful difference. Good luck.

drink cold coffee at day
and warm milk at night...
itll do the trick!

Take the meds that make you drowsy at night!

Work the night shift. I didn't like it at all, but it sounds like you would.

I used to have his problem. when I finally stopped resisting and just accepted the sleep schedule my body was determined to stick with, things got much much better. I've finally just accepted the fact that I'm a night owl.

Congratulation you have a sleep disorder.
There are a few ways that I know of to deal with this kind of trouble. One of these ways involves having a lot of sex before the time for napping comes so you tire yourself out just enough to crash. The second I know is about smoking a joint or hitting a bong till you just crash. Another one is about doing both of these things.
But if it really troubles you,you might wanna ask a doctor for some sleepy pills. They will put you back on the right track but also make a sleepy pill addict out of you. If you are against drugs,you can go for something a tad more natural but addictive and with side effects nonetheless such as valerian. Or see an expert in sleep disorders they are gonna give you some tests and ultimately tell you what to do. If you are a smoker you might wanna go easier on the ciggies,nicotine has stimulant properties and influences your sleep pattern.
Good luck!