First of all, you are only 20 years old, so don't be so hard on yourself. Secondly, there are good reasons as to why those high school courses are required. If you feel like math 11 and bio 12 are difficult, let me tell you, the human anatomy and physiology courses for nursing will prove much more difficult. Therefore, you need learn the basics of bio and math well. The road to RN is VERY competitive.