The pessimism in your post is really depressing to read. I cannot say I blame you though, the headlines have been full of negativity and we have a government trying to expedite the wish of the people in the most cack handed and reluctant way possible.
The UK has a huge potential to not only build trading links with countries around the World which we abandoned when entering the EEC, we have potential to influence structural change within the EU in these negotiations. The EU are scarred s...less of the implications of the UK leaving the EU and are actively working to undermine Brexit to reduce that impact. Meanwhile we have a government who are I believe assisting them in that process, but showing a different face to the public. Politicians are the biggest weakness of Brexit not trade. They are after all, the reason behind it!