Oh wow, where to start. I can't even prioritize.
1. Get some technique training, so you don't hurt yourself and have to take six months off healing.
2. Practice smarter, instead beating yourself up over the wrong things.
3. Don't ever play another gig with an abusive bandleader. Get paid, give notice, move on. If you have to, hire somebody to whip his ass, but make sure you get paid.
4. When you get a better offer for a pro gig, for gosh sakes, TAKE IT, DUMB-ASS! Don't hang onto some stupid chivalrous notion that your band is going to "make it". Chances are they won't. But you might if you show up and play your best.
5. Forget about your cheatin', lyin', four-flushin', no-good, soon-to-be ex-wife back in Virginia, and work harder while you're there in Nashville (or somewhere on the road) trying to be a bass player. Jeannie always loves you no matter what.
6. Don't worry so much. You ain't never not made it before. Playing bass is more natural to you than breathing. Don't make it harder than it needs to be. Have some fun. If it ain't fun, you don't want to do it.
*and that show at the Executive Inn, in Owensboro, Kentucky, October 1995... take an extra-long cable and a DI box, dude. Trust me on this, your 10' one ain't gonna' reach and the FOH guys are idiots. Thank me later.