Yikerinos! Let's unpack thiaUghgh, cough, sorry, something stuck in my throat there...
Reading this, it sounds like you've already made up your mind, or are at least really trying to convince yourself, so I'll just to say make sure it's what you REALLY want to do and make sure you've really done your research. (yeah it's wikihow I know but there's a good list of questions to ask yourself
here. Ignore the comments obviously, it's a bunch of conflicting information and idiots talking out of their ass, like everything on the internet.)
For real though, you only get this one chance to be a kid in high school and you're going to have the rest of your life to look back at this, so don't base the decision on some dramatic personal reason that will pass. And don't do it because someone IRL may be pressuring you, if that's the situation...it bothers me a little that your grandmother 'doesn't care', I have to say.
I guess my major concern is that it does sound like the main reason is because you don't want to 'deal' with getting used to new people. Is this some social anxiety thing? People do suck, and I despise them, and I get that that kind of anxiety can be a real, physical thing if it's bad enough, but you're going to be dealing with people all your life. Whatever it was like at your old school, I'd think most students aren't going to be out to get the new guy...although that can sometimes be the situation when you start a new job. McDonalds or Taco Bell are going to involve a lot of people, for that matter. I don't think there should be any sort of stigma attached to a job like that and some of them do pay well (and I would assume you don't plan to stay there forever anyway...) but that kind of job is fast paced, many of your co workers will suck, and dealing with customers can be extremely stressful. So it's not a good fit for every personality type.
A candid look at what's pretty much the work environment at every McDonalds, 100% of the time:
Video embed was autoplaying for some people so just have a link until I can fix it lol
I'm not sure exactly what the situation with your brother is or how much care he may need, but you won't be able to use watching him as an excuse to miss work. And of course if the money is the real issue, it's possible to work and go to school at the same time, like End said. A lot of high schools will even help you out with work study programs. High school by itself though, you just have to show up and you can pretty much coast along till graduation. Regardless of your reasons for not wanting to do that, getting a GED will be tougher because it's something you have to actively pursue.
The age requirements
vary by state but it's unlikely to be something you'll be able to immediately do. Are you going to still be focused and ready to go for it a year from now? Two years?
Keep in mind also that it's not possible to get a GED online, so don't fall for the various carefully worded scams out there that will take your money for what amounts to a prep course. Is there a testing center near enough that getting to it won't be a problem?
Chris already mentioned Job Corps, and you should look into any other programs available. The key thing if you do drop out is to avoid those years of meandering and flailing that go nowhere and are so common afterwards by having a plan in place. Don't just tell yourself you'll take care of this stuff 'later', treat it as if it's a reality right now. You should figure out all your options, do the research, make phone calls, fill out applications,
before you actually pull the trigger on this.
Since it's only what, four months till summer vacation? Why not just go to the new school and see what it's like? If you hate it, don't go back after the break. It may go better than you expect. And in the meantime you could be taking an opportunity while you're there to talk to a school counselor about the availability of work study programs, or even summer or online classes that could speed you through graduation...or there might be other solutions, you just have to tell them what's going on. Whatever your situation, it's not going to be something they've never dealt with before. Most people in public education genuinely do care about kids and want to help. It's not like they're just in it for the shit pay.
(I'm assuming that you've got at least another full year to go after this and aren't meaning to bail with the finish line in site right there in July.)
Last link:
http://neatoday.org/2015/06/08/why-students-drop-out-the-economic-pressures-that-make-leaving-school-unavoidable/
National Education Association site, with a list of related articles there with people sharing their own experiences. There's a whole category for 'Students and Social Issues' that may be of interest if you aren't bored by the first one. And although they may contain relatable information, as a person who uses a writing site you might find the lack of proofreading on these articles amusing to spot as a sort of meta game while reading them.
Anyway, good luck with whatever you choose. I don't want to read too much into things, but when you're talking about your mom stealing your shit and then mention you're living with your grandma in another state, it sounds like there may be more to the story there...so just hoping things work out for you in general and keep improving, whatever's going on.