I also think music school would be a good idea if you want to become a professional musician. You don't have to do berklee or some private school. I think you'd get a lot from the classical/jazz program at any university. Some public universities/colleges even have contemporary music programs if that's your thing. Look around, and try to look at their teachers; try to find someone you'd like to learn from.I do tend to pick up bass lines but ear and play with them on their radio now for the reading music part I plan on doing that before the summer is out
If you don't go to school for it, find yourself a good teacher and set goals. Even though you "could" learn everything on your own I think having a mentor is going to be a HUGE help to your development as a musician.
Also, I didn't read the whole thread but since I'm sure it was said....don't let anyone tell you that you can't be a pro, or that it's not worth it. That's for you to decide. There's no reason you can't become a professional musician and make GOOD money from it. The whole idea of committing to a life of poverty if you choose to be a musician is ridiculous.
The only concern about being a pro is understanding what it entails and making sure it's what you want. They may overlap but There's a big difference from having a creative vision/making your own music and wanting to play music professionally.