Prior to leaving nursing, you might want to explore some other nursing areas first. Just a thought. You worked hard for that nursing license, and possibly neither of two areas you have been exposed to, are for you.
I've worked most every area of nursing you can name, (see my page) but, i was blown outa the water by SNFs and any unit where you get tons and tons of patients. I have deep respect for those nurses who can care for 20, 30, 40 patients, but, i lack the skill to do that well.
some areas you may not have considered, are the IV team. Lotsa fun, imo. You get a ton of autonomy, get to run all over the house, be in the middle of any goings on, and until they begin to pressure you to learn how to insert PICC lines, you might find the chance for errors to be less than floor nursing. (not that IV nurses can't make errors, sure they can, but, imo, it's a more straight forward, linear type of nursing, imo. Your notes are almost a checklist to prevent some errors, too) Sure, sure, even the best of IV nurses, sometimes have to call each other to put in some IV they have missed, that happens now and then, and it's humbling, but, otherwise, it might offer an appealing change from floor nursing.
ONce you have more experience, there are many other options available. Not sure if your PACU unit would accept such a new nurse, but, IF they do, PACU might offer more nearby support for you, as typically, many have the patients pretty close to each other, so help/mentoring is never far away. PACU might offer more of a 'routine' to appeal to your organizational side, (NOT that PACU can't have it's crazy days, it's times where you encounter the absolutely off the hook moments, too, but, generally, it's more of a routine there, from one patient to the next)
Especially in OUTPATIENT pacus, where most of the ppl are not acutely ill/coming from home,
and the surgeries are minor enough, the person is going home. Lotta patient teaching, which you'll have to learn, but soon enough, you'd have the basic routines down (of course, sometimes a patient comes up with some new, never heard of situation or question, which we have to consult around for, but, most of the time, it's very pleasant work).
ANYWAY, maybe if you look over the "Specialties" forum of allnurses, maybe you can find one that appeals to you, to try out, prior to leaving nursing.
btw, don't beat yourself up too too hard over mistakes, every nurse has made 'em, and we all just hope that when we do, it's a minor one. Becoming a nurse isn't something you learn in school, imo,
it takes years after to become a nurse. You are in the hard part now. Maybe a less stressful unit might help. (i myself think those units with huge patient/nurse ratios are so so so hard)
BEST OF LUCK whatever you decide!!