Hi there Helzy, I'm very familiar with anxiety and lack of confidence - my mother wrote my very first post here on my behalf.
I left school shortly after turning 14, only really got into studying in the final months leading up to GCSEs and didn't really do much there. Yet, on the basis of my interest-related projects that I maintained online, the sixth form college let me onto their course.
I didn't have any major issues there (at least for someone who had been away from mainstream for over two years at the time), especially with the very supportive staff and a clear and understood no-tolerance to bullying, but left the following February due to depression, though still managed to retain a distinction for that year.
Hope you stick around
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I'm always here, all you have to do is ask and you shall receive