And here's something else to keep in mind: If you really love music and see yourself as always being a musician, come hell or high water, then don't just expect that success will only be measured in terms of money. It is o.k. to be an amateur. Many amatuer musicians write great music and are happy with doing it.
The music biz has changed over the last 30 years. It used to be that kids in their 20s would form a band, do a gig, get signed to a label, record, do a tour, sell albums, make it to the top ten, get rich, and either blow it all or invest smartly and retire. Nowadays, there are so many people doing it that it has become a sort of "anyone can do it"-"free for all" kind of thing. For example just look at this forum and the fact that it is a "home recording forum". In today's music landscape you have bands recording their own songs in their home studios, setting up their own websites, forming their own publishing indie labels, gigging, and managing their own tours and doing it all in the RED or at least making only meager profit. That is the norm, and I'd be surprised if anyone believes otherwise. I would bet that 95% of the musicians on this forum actually have full-time day jobs. That doesnt' meant that you aren't successful, it just means that you have more than one talent.
Think of it this way. If you get into in the first place because you want to make big bucks, then why not open a shoe store instead? Why not get into any old business and pay attention to supply and demand---provide a service that is lacking in your market? Chances are overwealming in your favor that you'd succeed in the shoe store business rather than in the music biz.