I know what you mean about juggling treatments, school, social life. I have both of my children in a home school \distance learning program. My son will be a senior next year. My daughter is the one with CF, and she will be a freshman next year. Look into it because it will expand your options if you change your mind later about educational avenues. My daughter has been able to go into the hospital, do a month of PICC lines, etc without falling way behind. She can do her work on a computer and do many breathing treatments at the same time so she has more free time. The program we use is connected with the district here so she will get the same diploma, walk the stage upon graduation, has a prom--it's been a lifesaver. My son is like you--hates school--but I wouldn't let him get a GED. If your parents are like I am...try the online high school options. I wish it was all easier for the CF community, but computers make it much better than it was when I was a teen to get a degree from home.
Best of LUCK!