Nyx, I think the question of how much Scotland contributes and how much it gets back is more complicated that you present it there, but I do think we'd be worse off without the Barnett overall. I don't pretend to understand the finer details, but I have noted that everyone, including the SNP, recognises that losing the additional Barnett formula money would be a disaster.
From what I understand, whether we are net contributors or beneficiaries varies year on year, and we are contributing a lot less in tax now that the oil price has crashed. And this speaks to a wider point - out economy is fragile and very vulnerable to external factors such as oil price. We don't have the economic diversity that the rUK has to be able to buffer these storms, and going it alone on the hope that our economy will make it seems extremely reckless to me. Not least because the SNP has had a decade to grow and diversify the economy and have failed to do so - this would surely become a much harder task without the safety net the UK provides.
We obviously have different opinions regarding Scotland's future, but I see considerable reason for hope within the UK once the Brexit storm has passed. The Scotland act gives us massive power to go our own way and grow our own economy/set spending priorities etc. as we see fit (as we have done since the Scottish parliament was created). All we need is a Scottish government with the desire and capability to do so.
Fwiw, I think a lot of the perceived anger towards Scotland is in response to the way our elected MPs behave - yesterday they were once again making clear that they couldn't give two hoots about the UK and were demanding to know what was being done for Scotland specifically. Our First Minister is more subtle about it, but she also does nothing but make demands and threats, and takes every opportunity to suggest that Scotland is just that bit different (with the subtext that we're just that bit better). It's amazing there isn't more anti-Scottish feeling frankly, but I think most people realise that they aren't representative of Scots as a whole.