Hello everyone. My name is Stefan, I am fifteen years old. I come from Serbia.
Ever since I was a kid I wanted to play piano. But, I didn't - instead - (I don't really know why) I played saxophone, which I didn't particularly like. I played it for two years (in a music school in my hometown), quite successful (I won several competition prizes) and then I quit, because I didn't enjoy playing.
Now, I want to play piano. I know it's maybe a bit late for me (I'm 15), I'm aware of the fact it's very difficult, but I am really dedicated, hard-working, and willing to practice as much as it takes for me to learn how to play (after the entry exam for music school when I was 12, they told me I am very musically talented).
I've been looking for some place like this to ask for advice - so here I am. Every advice will be welcome from you guys.

Should I try the music school again, should I go to private classes or try to learn on my own?
Also, I've been thinking about piano purchase. I'm reading Graham Howard's book on digital pianos, for few weeks I've been browsing internet for purchase advice, and I think I'll buy Yamaha YDP140 digital piano. Is that a good decision?
Thank you a lot.