I'll say this, I'm on my 3rd career going into nursing at 34. I wrenched on cars, then joined the military, and now working on the nursing gig. If I had tried to get into nursing fresh out of high school, no way would I have even gotten accepted to my program. There's a certain maturity level required to do this, and at 18, I'll admit that I didn't have it. You have to put the time in. You have to dedicate yourself. I'm sure you've heard the saying that for every credit hour, you need to study 3 hours at home. That's no joke. 12 credit hours + 36 hours of home study... per week.. it's a full time job. You may be able to get past your gen ed stuff by showing up and hacking a few assignments 3 hours before the deadline; nursing school is not that forgiving. You honestly need A's and B's for biology. If you don't, you'll never get past microbiology. Then Anatomy and Physiology. Then pathophysiology. Then pharmacology... it all ties together, and you better be on your game or you'll get left behind real quick.
Ok so, soul searching and my military motivational speech aside, you can totally do this. Community college means a whole lot of nothing honestly. At least as far as accounting goes. You mentioned 2 classes, and if that's all you've taken so far, you've got a lot of time to make up for it. I took algebra 3 times. I took chemistry twice. I had to take extra humanities, philosophy, and literature classes, because I always seemed to be missing some course specific credit because 1 school accepted my grade and another didn't. I felt like the BS classes would never end. But boy when it did, it ended quick. Speech is required, accounting is not. Chalk up your F to the college Gods. You GPA means nothing right now, and it wont for the next 2 years until you actually apply to a nursing program. By that time, you'll be rocking a 3.5 because you're smart and that's generally what you need for most programs. You haven't lost anything yet, so go forth and learn.
Put in the time, get the good grades. If you fail a class because you didn't understand the material, figure out a different way to learn. Me personally, I can't study at home. I have to go to the library, or some other room at school, and I need people to study with. If you fail because you didn't do the assignments, perhaps you should find another line of work. We're professionals here, and if you're going to be one of us, we expect you to be responsible and professional as well. That starts now. Not doing your work at school = not doing your work with patients. Don't be that person that cuts corners. There's no shortcut for this.