@kisspow
I support you and all of your feelings. Good for you for reaching out to find advice and support from others. What you’re going through is difficult.
You are a different person from your brother. I’m sure that you know that, but it’s worth saying again: you are different. You will experience things differently. You have different talents. You have different ambitions and values. Sure you share many things, but you are different and it’s no surprise to me that your HS experiences are different.
First, don’t worry. You will be fine. No matter how you do in HS you will find a great path through life.
The easiest path that most people walk along is 1) do well in HS, 2) attend good college, 3) have decent career in something solid; 4) retirement; 5) boom, you’re done. This path is straight forward and from a parental POV it’s also “safe”.
Just because it’s “safe” and expected, doesn’t mean that it’s the right path for YOU, however.
There are many other paths.
As others have mentioned, another path is to just get past HS somehow. Either graduate with your basic classes or, if the anxiety gets to be too much, last resort is to drop out and get a GED. If you can hold on and graduate from HS somehow, regardless of GPA, then that’s the best approach, but for your peace of mind it’s good to know that GED is a viable option too.
AFter finishing HS somehow, you can take as much time as you want before attending college. As long as you don’t get married/have a family of your own and as long as you stay healthy, you can take your time deciding what to do. You can figure out your interests. During that time you can work in many exciting and wonderful jobs. If you want to leave home, the Student Conservation Association has work with housing. Volunteer.gov has work with housing. Workaway has work with housing. Coolworks lists jobs with housing and pay. Americorps NCCC/ Vista/Fema all have work with housing, a stipend, and money for college at the end. And you can work and volunteer around your local community and live at home.
When you are ready to attend college, you can always raise your grades in Community College then transfer to any college in the US. You would be a “nontraditional student” and there are many excellent schools and programs for nontrads. https://en.wikipedia.org/wiki/List_of_programs_and_colleges_for_non-traditional_students This is a partial list. Virtually any college has room for nontrads, even if they don’t have a special program. You would apply as a transfer student.
For now: I suggest talking with your parents. Do this calmly and in a public place so that everyone is on best behavior. Tell them clearly and calmly that you love them. You respect that they are trying to do their best by you. But that you want to try something different. Assure them that you can work with them and your guidance counselors at your school to find a strong, viable path, and that path will probably be different from your brother’s. You can reassure them that you are strong, smart, mature and will consult them, but that you would like to start trying something different.
This may be a shock to them. Expect some disagreement, but if you remain calm, and clear, they will see how mature you are. And that maturity will help them be brave. Your maturity will allow them to believe in you, and they will probably allow you to take your own path.
Best of luck.