URGENT i don't know where to go for sixth form

from yr 7 -11, i've studied at a local state school which doesn't really have many extracurricular opportunities, and usually performs below the national average in exams. nevertheless, the vibe is very friendly, i love the building, location is very convenient and i really like my teachers. i was also able to achieve all 9s at gcse (though i dont really credit the school because i had to self teach myself a LOT). quite a lot of my friends are staying at the school (which is a huge pro), but they would be taking very different subjects from me (stem, whereas im mostly taking humanities). im a bit cautious about staying at the school because the a level results at sixth form are very mediocre (average is a c) and current/ex students have warned me to leave.
i've been offered an 100% bursary place at a private school, which is close but not as close as my current school. i loved the building during the tour they gave me, and the teachers also seemed very friendly. the extracurriculars they offered were far beyond my current school, and their a level results were also exceptional. the cons are though, the school day is a lot longer than my current school, i don't know anyone there (im not against making new friends, but considering the students would have already made tight-knit friend groups since yr 7, i am a little scared.) its also an all girls school, and i currently go to a mixed school. i feel like this means the vibe would be so different, and difficult to adjust to. i am also a bit worried about the fact that even though i come from a disadvantaged background (live in a deprived area, parents didn't go to uni, low household income, went to an underperforming school for gcse) the fact that i would be going to a private school (for free) for a levels would completely negate that to unis, and i would no longer be eligible for contextual offers? idk if im just overthinking this though
anyways, i would love to hear your advice, if anyone's been through a similar situation/what would you do if you were me?

Hello,
I moved from a mixed comprehensive school to an all girls grammar for A Levels so I was in a similar situation to you. I think you should always take the chances give to you. The jump was scary at first but over time I was able to settle thanks to my teachers and classmates. In my current friend group, I'm the only external but they've all been welcoming.
However, with that, comes the trade off of going to a private school. A lot of initiatives don't allow students from private schools to participate in them so I would do your research to see what competitions and programmes you would be allowed to enter if you moved to that school.
Unis during the application process should acknowledge how you came from a disadvantaged background since you have to put all your previous schools, whether youve received school meals in the past, etc. on the UCAS application.

thank you, i really appreciate the advice! hearing that you were able to settle makes me feel a lot less worried abt the change. also, you made a rlly good point about initiatives not open to private school students so i'll do my research! tho, i want to study politics and economics at uni, and i don't think there are that many programmes tailored for that compared to subjects like medicine/law etc. thanks tho!