Hello Pengu8!
Best of luck to you, and you don’t have to worry about your GPA. To answer your first question, NO, a 3.5 GPA is not a bad thing. When you think about it, it is actually a blessing in disguise. For example, one pro/benefit of the IB Diploma Programme is that GPA is counted up to 5.0, compared to 4.0 for standard level classes. You are rewarded 5 points extra for each IB class you take (i.e. If you have 80 in IB English then the 5+ points make it to 85, a B; you have 88 in IB Biology 5+ points make it to a 93, an A.) Also another secret is that if you have a C in a class, it counts as B in the transcript, or if you have a B in a class it counts as an A in the transcript. If you have an A in a class it basically counts as a 5.0. Why? Because, since you are in the IB Diploma Programme, the GPA can go up to 5.0.
To answer your second question, you should continue the IB Diploma Porgramme, for several reasons. First reason, is although it may be hard, time-restraining, it will benefit you in the future. I know many friends who were IB Diploma students who got into very selective schools (i.e. Princeton) and said that the IB Diploma Programme had helped them tremendously. Secondly, in a AP class you are isolated from other students due to different ways to pass the class for different students, as opposed to the IB Diploma Programme where they use rubrics to grade certain things, which interconnects you with other students, therefor you and other students can work together to pass that class, and it builds friendship and trust. Thirdly, the classes and schedule in IB Diploma Porgramme is way more flexible than AP classes. Lastly, the load of work is supposed to guide you as a blueprint, and actually CAS, TOK, and EE are worth it because you need to pass these criteria to get the IB Diploma, as well as passing the IB Exams.
Your third point is myth. Just because your friends have 4.0’s, doesn’t mean that it will help them. Actually colleges(universities) want to see if you took harder classes (IB classes) and challenged yourself. Sometimes that hard-earned C is worth more than getting an easy A, if you know what I mean. Now, I’m not saying that AP is not good, it’s just that the IB Diploma Programme is far superior compared to AP and more worth it. Colleges will be pleased at you since you attempted challenging courses, and that 3.5 GPA is actually well-advertised. Also one more thing, apply for more colleges, so if you don’t get accepted into your desired college, you have another shot at another one. Remember work smarter, not harder…
Hope this helps! Also good luck on making it to UCB, I wish you the best!
P.S. I am a Sophomore, planning to do the IB Diploma Programme.