Walrus, I wish you well.
You are in a difficult situation. Your family is in a cult and offer you nothing but impediments to your growth.
You have ideas about WHO you want to be, but - this is not meant as a personal attack - it can be VERY DIFFICULT for a person in your age group to MAINTAIN FOCUS on attaining the goals they want. I suggest that you develop the habit of every day writing a brief note to yourself reminding yourself of what your long-term goals are. Write the note, read it to yourself anytime you have a chance during the day, and at the end of the day. You will "program" (or "brainwash") YOURSELF into keeping your goals in sight. This will help you overcome negative 'self-talk' - that ugly little voice that many of us have that tells us we will fail. Learn to ignore that voice.
WORK HARD to achieve those goals. STUDY intently; get tutors to assist you with any subject you find difficult, get physically FIT and STAY fit; the mind and body are one and each needs the other. Lastly, SERVE others. Be a tutor - help others learn. Don't allow yourself time to fixate on your difficulties. Keep moving forward.
You can do it. It is your destiny.