How do I tell if I have my own writing style :P?

Everyone has his or her own unique writing style, even young children. And everyone's writing style changes over time, as he or she learns more in school, is influenced by reading what others have written, and of course by practicing. I guess I'm a little confused by what you're asking here. In general, my advice would be to just keep writing. Don't worry about your style. If you really love writing (and from what you said, it seems like you do), then just write.