I'm crushing on my friends older brother, what do I do?

mmkay, this is pretty hard and complicated right here, so if you’re willing to read the entire thing, I love you :) <3

(I’m a 14 yr old girl :D)
I’m crushing on my really good friend’s (guy) older brother. Um, all in all, I’d say that if I really decided to date him, it’d be awfully weird for my friend, hahaha…
I’d never met his brother until a bit ago, because I went over to their house to play some video games, but we’d always made fun of his brother prior (calling a him a raper, stalker, creeper, etc ((but not literally! Just joking type of things, like in texts)). I’d heard much about his brother too—He plays REALLY good piano, plays and likes all the same games I do, has a lot in common with me in general (he’s 15 by the way). My friend really doesn’t like his brother all too much, you know, typical siblings. And, uh, I don’t know, they’re kinda the same in both looks and mannerisms.
Truth be told, I had a big crush on my friend, because I thought he was really cute. I got over it, since he was too good a friend though.
And then, his brother… oh. my. god. As soon as I got to their house, I made him play piano for me, and I think I fell in love (not seriously, figure of speech haha). And he’s really cute, too!
* frustrated noise *
My list of things I look for in guys are all checked off with him :(
Cute, smart, nice, plays piano really well, not incredibly shy, and likes to talk to me.

And here, I am confiding in you, residents of fluther, because I can’t tell ANY of my friends about this, or my friend who’s older brother I’m crushing on will hear, and he’ll think I’m a complete psycho for it.
Please, spare me any advice you have or any questions for further details, because I am TRULY at a… moment of dire confusion and I cannot get the image of him playing the piano for me out of my head.