I think people are a little naive as to what it takes to move abroad, especially at such a young age. You are not going to be giving it 100% if you are down and depressed for whatever reason.
I moved to Brazil when I was 13 with the parents and it was a huge shock. I was alright at school here in the UK but bloody awful in the private educated system with the offspring of millionaires. I didn't really connect with anyone in school enough to socialise outside of school, nobody of my age in our apartment block. I ended up moving back at 16 having lost all connection to my old mates and having to resit my GCSE's.
Moved to Brussels at 12/13 and it absolutely tore my family to shreds. Twenty odd years later and I'm still trying to get over the calamity.