Don't worry about whether or not your passions, hobbies, and interests are "cool" or not. If you're an adult or teenager who likes kids' shows and movies, don't be ashamed. If you're a Trekkie or a Star Wars fan or a Lord of the Rings nut, embrace that. The more you embrace your own interests, the happier you are. If anyone makes fun of you, it's just because they are jealous that they aren't as happy as you.
If you can, try to learn a musical instrument. It will expand your mind.
As much as school sucks sometimes, you will need it later in life. Yes, even chemistry. Chemistry especially. Chemistry will teach you why you should NEVER mix bleach and lime-away (or CLR, or vinegar). That's a real-life application that can actually save your life. Don't believe me? Ask your science teacher.
And yes, you need math too. Especially unit conversion. Especially when you live in the United States where we don't use metric. Algebra and trigonometry, too, depending on what career path you choose. Also, don't underestimate arithmetic. Someday you will be working a cash register and somebody will give you an odd change amount and you'll accidentally skip the screen that tells you how much change you need to give them.
On a related note, learn how to count back change.