Hello

I'm looking for advice, opinions, etc. on what I should actively pursue and dedicate myself to. There are really only 2 things that greatly interest me - music and astrophysics/cosmology.
I've loved music my entire life, always with the thoughts of 'making it big'. But a few years ago, I started getting into astrophysics/cosmology and the likes, and found out I was really interested in them. Now I don't know what to choose...
When it comes to music, it's not all just practicing constantly and honing your skills - there's a matter of luck too. When it comes to the other path, well, I'm no Einstein, and didn't even finish highschool. So I honestly doubt I'd make it through some highly prestigious university.
I know most say do what makes you happy. Well both do, but I don't want to just do what makes me happy. I want to make something of myself, too, and if I'm going to do so, well I figure I should dedicate 100% of myself to that one thing.
So that's pretty much it... Thanks for reading, I tried to keep it simple yet explain it as best as I could, so I hope what I'm trying to convey is clear.