- Do you meet all of the UC/CSU a-g requirements with C or higher grades? See http://admission.universityofcalifornia.edu/counselors/files/csu-uc-a-g-comparison-matrix.pdf . If not, starting at community college is what you need to do to get into a CSU or UC.
- By high school graduation, will you have completed at least precalculus, high school physics, and high school chemistry, with C or higher (preferably A) grades? If not (or if you only earned C grades), you will probably need remedial course work in college, which could be much more expensive if you start at a four year school than a community college.
If you still want to go to a four year school, calculate your CSU/UC weighted-capped GPA using this calculator: https://rogerhub.com/gpa-calculator-uc/ or https://www2.calstate.edu/apply/eligibility-index .
Now use https://www2.calstate.edu/apply/eligibility-index to find out what SAT or ACT score you need for minimum CSU eligibility. However, this will only get you into CSUs which are not impacted for either the campus or the major. Where there is either campus or major impaction, the admission standards are higher.
There is no non-impacted CSU with aerospace engineering. However, many go into aerospace from mechanical engineering education. Of the CSUs with mechanical engineering, SFSU is not impacted for the campus or major, and CSUN admits local area applicants at minimum CSU eligibility.
Of course, you also need to consider how you will fund college. If your home environment was a problem, will your parents contribute and/or cooperate with financial aid forms?