It's OK to blaze your own path in music. If you want to hang with jazz guys, then there is training to think the way they do. If not, it's less necessary. I have "classical training" ( school orchestra when I was young) and understand a lot of serious theory (but not what they teach in music school) - I studied Acoustical Physics and Psychoacoustics, and I can tell you WHY intervals sound good (or not). but my bass knowledge past that is all self taught - I play (very well) by ear or from chord charts, and have gotten quite good at memorization.
Once in a while one of the tunes I'm playing will have enough freedom in what I'm doing that I'll find myself thinking "this is a Jamerson-esque line I'm playing". OK, that may be part fantasy, but there is a bit of truth to that as well.
A couple years ago, I realized there were some basic things that I kinda skipped over, so I got the first 3 Mel Bay books, to shore up that stuff. I did open the books and start, but didn't get very far - I have too many gigs to prepare for to go back and figure out what I missed by doing things my way. I've decided I'm OK with that.
Work on what you thin is important. If you find yourself lacking in something, figure out a way to learn what you're missing, but don't assume that there is one path to success as a bassist.