hmmm...
well, it's good to see younger people trying to learn the software. (Man I sound old...and i'm only 23!)
So, here are my words of wisdom: Photoshop is a great tool that CAN DO ANYTHING you can dream of, but that doesn't mean you SHOULD DO ANYTHING. What i'm getting at is learning the software is great, but anyone can learn software...focus on esthetics and good design principles. Look at how different typefaces change the meaning of what you are doing and how color also effects this.
other than that, it seems you learning to get around in the software pretty well, and if that's all you want...then you are your way. I would just recommend studying up on design principles.
This is what a creative director told me one time on an interview:
"I can teach a monkey to use the software...but i can't teach the monkey to think conceptually. Find me monkey that can think outside of the box and i'll pay it six-figures to walk in the door"
