Would i get rejected right away from the college that i wasn't to get into if i get another D?

Probably not going to happen with a UC. Most that get into a UC have nothing lower than a B in any cl. You should have a good chance of getting into a CSU though. It is a plus for you taking AP cles as it shows you want to challenge yourself. You definitely need to stop getting D's though. If you don't understand the material, get with the teacher before or after school. If that doesn't help, get a tutor. I don't know if extracurricular activities are taking you away from your studies, but if they are, you need to stop them until your grades improve. You are at a point now that if you can show improvement, you can really increase your odds of getting into a good college. Good luck!