I don't want to be a photographer as a career, I know I'm not good enough. But I do like taking pictures and I want to get better. Any tips? I know what camera I want: a canon powershot. I don't want an expensive proffessional camera, I'm only 13. The power shot is fine thank you. I just want tips on how to take better pictures. I even have photoshop so I can edit them and make me pretty! :]

I think out of all the pictures I've taken I like this one best:
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My best friend says I frowned too much, my other friend says its good to show lots of emotion.
Here's a couple others:
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New Images - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting...

I don't want to take pretty preppy pictures for myspace. I want to take more unique and serene pictures.

My question is: How can I take better pictures? What are some good tips and advice for better photography?

Your pictures ARE good enough to be a professional photographer. Your focus is good.
Your composition is fantastic.
To change from pretty preppy pics to more unique and serene pictures maybe your subject matter needs more variety.
If you are wanting 'softer' looking pictures rather than glossy maybe try using a paint program to alter the effect.

Really?
Because I changed my mind
I DO want to be a photographer

I wasn't able to get your photos to load so I can't comment on that, but I will say this: Your skill level can change a LOT between age 13 and when you'd actually start a career, so don't count it out. I've been a professional photographer for six years and I get a good laugh out of looking at photos I took when I was your age. One book that I would recommend for stretching your horizons a bit is "The A-Z of Creative Photography" by Lee Frost. It covers a pretty wide range of topics. If you want to expand your skillset with Photoshop, virtually anything from Scott Kelby is a good choice. One of his that I have used in the past is "The Photoshop Book for Digital Photographers" but he may have a newer version out now. And -- eventually -- I'd suggest upgrading to a DSLR camera. Good luck!