I'm going to be blunt and speak openly here.
Taking the NCLEX and failing it 4 times already is a reliable sign of a deeper seated issue. How have you done in nursing school, did you get good/decent grades (B, B+, As?), were your grades consistent? Could numero 4 have happened because of some fluke that was completely out of your control each time you sat down to take the NCLEX? I find it hard to believe this could be the case.
The most important question is - how sure are you that this is the right profession for you?
Say you take the NCLEX the 5th time, and you pass, and you are left feeling that you barely scraped by ... Next up! Taking care of patients (how about increased pt load??), pts who may be very critically ill, or in an emergent situation, and rely on YOUR solid nursing judgment and knowledge. You have your license, you are autonomous and solely responsible for decisions that you make. Will you be able to step up and take care of your patient(s)? Even if you are a new grad and under the guidance of another RN, this does not mean you can "just kinda hope for the best".
If I had a family member/loved one who was critically ill and under your care, and I knew about your past academic history, I would request another nurse. Patients do not have the luxury of knowing, they simply have to place their trust in you, end of story.