I think I sleep a little TOO much

When I don't have anything going on, (weekend, no school..etc) I sleep wayy too much. I usually fall asleep around 12 or 1 in the morning, and wake up around 3, 4, or even 5 in the afternoon. That's 15-17 hours! And that's how many hours it takes for me to feel good during the day. They say 8 hours is normal, but 8 hours for me is hell to wake up to. I don't feel refreshed in the morning, and I spend the whole day at school waiting to get home and take a long nap. I'm not lazy or anything, I play 2 sports and I often go to the gym. Could there be something wrong with me? Is hypersomnia a disease/condition?

Sounds like you have hypersomnia. Here is some information about it:

Description:

Hypersomnia is characterized by recurrent episodes of excessive daytime sleepiness or prolonged nighttime sleep. Different from feeling tired due to lack of or interrupted sleep at night, persons with hypersomnia are compelled to nap repeatedly during the day, often at inappropriate times such as at work, during a meal, or in conversation. These daytime naps usually provide no relief from symptoms. Patients often have difficulty waking from a long sleep, and may feel disoriented. Other symptoms may include anxiety, increased irritation, decreased energy, restlessness, slow thinking, slow speech, loss of appetite, hallucinations, and memory difficulty. Some patients lose the ability to function in family, social, occupational, or other settings.