Resigning from a position immediately?

So I just accepted a job offer with better benefits and pay, the thing is I haven't been in my position very long 4 months to be exact and I feel this company is going somewhere that I don't feel apart of anymore but I just don't know how to tell my boss and supervisor, that I plan on leaving. I asked couple friends and they just tell me to do a resignation letter to my boss that my termination will be effective immediately after Sunday. I want to put in my two weeks notice but I want to leave this place ASAP! I cannot handle being in this position anymore even though I have a nice coworker and supervisor but everything is getting strict like were little kids and trapped in a building for 8 hours and we're not entitled to get holidays off we MUST work if we're scheduled to work. This position I accepted has Mon-Fri and a hour lunch break and gets Holidays off and Admin leave if bad weather is upon us like this morning roads were so bad someone almost rear ended me and 2 cars rear ended each other in front of me so that was scary.

I just don't know how to say and doing a resignation letter without notice would most likely make me look bad but it's a good reason because I have a car payment that's over $400/month and I only make $10/hr so that's almost my whole check.

Sorry if I dont make sense but what would you do?