Niko,
I only have so much stuff because photography has been a hobby for me since a B&W Kodak 127 roll film camera came my way in 1964 when I was a kid. I've always loved to take a few photos. I really like digital because it frees me from funny smelling darkroom chemicals (used to do my own color film processing in the 70's and 80's), and gives me instant feedback with histograms, etc. I can then post-process in Photoshop as required to fix boo-boos, crop, sharpen, etc. Your D90 is a nice capable camera, I'm sure that you get a lot of good use out of it!
Bill.