If you go to a teacher, and he's a jackass, and you see him for a jackass, don't bother about how fast his fingers go on the fretboard. Tell him to go to hell. He'll see you as an apportunity to suck some money and at the same time belittle you. I had a teacher that told me I could never do anything over play chords on a guitar and he was wrong. I suggest
http://www.activebass.com and lots of patience. If you really want it, you'll get there. Oh, and compose, compose, compose. Even if they're just small ideas you discard afterwards. The process of composition is what matures into creation that will be fulfulling.