I'm sorry Simon that you are feeling so different and inferior... of course part of that is your depression
I wonder... and I ask just because I don't know, not to imply anything... how many compliments you give out at home? Can you say, the next time you hear a song you might not like but your brother does.."Hey, there's that song you really like!" ??? I'm also wondering why you felt it ok to call your dad up to your room, rather than going to him to ask a question? If it was a question about something he needed to see that was in your room, that's one thing... IDK... I was taught one way to respect elders was to go to them, and speak to them...
Creative ppl often don't feel as though they fit in....often they don't! That doesn't mean they should lose their creativity to fit in... I hope you will work hard to get to where you want to be, so you can enjoy yourself when you get there!