Are you living on your own or are you still at your parents house? If you're own your own, quitting your day job wouldn't be the wisest choice. But if you're still living rent-free, then this might be a good chance to focus on music before you have to deal with other living expenses.

My parents won't accept money from me like that.  It's because they're very 'well off' and well, dont' want to take my money.

I figure I will only have to make about $300 a month to be even with what i'm making now.
I already have all the gear i need and a jam place.
Before i quit i'd pay off all debts (except car) and try to save maybe $1500. And i already have band members wanting to get this going too.  I really want to do this and if all goes well, i'll quit in dec or january.  I'm gunna keep my fingers crossed so wish me luck.

Having the son of the barowner as a member of the band can add some uncertainty to the situation. Where is his loyalty? When you have artistic differences with him will you be allowed to stay in the band? If the owner fires the band is his son fired too, or can he form another band to play?
I don't want to be negative but look at this relationship and factor it into your decision. It seems to be too uncertain a situation to quit your job for.

Sounds like maybe its the wrong day job -- for a start it's p.m. shift, right? So maybe get something part time or at least drum-related like selling drums on Saturday. Ever thought of acting? Sometimes music and acting/modelling go together, and I often meet guys who do house renovations and music together. If you act and play drums you'll get all the drum parts in movies/TV, I know someone who does this (he's actually very annoying...)

It's the wrong job and there's always another job, right?

--Sarah.

Take care. That's C.A.R.E (cover ass , retain employment).
If you get an abundance of gigs have to pay the tax man eventually which would possiblyaffect your unemployment payment???More if you get caught out. Well it works that way here.
My band declare all gigs that are advertised (in case they check up)or any subject to tax payments from working at establishments as a secondary income.
An occasional private function is cash paid into our pocket and leaves from there also.
i.e don't bank undeclared hoot, or be seen in a 2003 Z merc when your on a benefit, unless you are good at explaining..
FWIW a paying job with the extra income from playing gigs is a cruise as opposed to living on the bones of your ass, unless you really like that lifestyle. I did it for a while, and enjoyed it for a while but i had to find casual cash work labouring to put food in the tum.
Another lesson in life. DON'T RELY ON GIG MONEY. All sorts of unexpected things can happen from cancellations, illness,rip offs, etc.
Getting hitched changed all that for me, was not a bad move. I now  have clothes, a reliable van, a nice drum kit ( paid from gig return), a nice motorcycle (my hobby), security, a place to call home and a reason to get up every day (like it or not).
The ultimate day job would have to be in a music shop selling/ teaching drums, or the day could be spent wisely training for a music related occupation, ie sound engineering, retailing etc. Note ,i purposely ommitted roadie.

Wow, thanks for all the advice, it really opened my eyes.  I think i'll just try to get on a new shift so i can jam often and keep my job.  I'm also coming into some money in the next few months so i think i may buy a bike, i can get a yahama 125 for like $35 a month!  So yea after reconsidering I'm more leaning towards keeping my job and i'm also gunna see what kinda education course i can get into in the next little while.