It's good to see a robust and coherent explanation of your decision to support Leave; thanks.
What you say about anti-EU sentiment in the 27 member states is undoubtedly correct; I'm sure there are many who hold critical views and would like to see reform of the supra-state. But the desire to seek reform suggests a degree of commitment to the project; that's quite distinct from a desire to end membership.
Recent EU wide polling suggests that exit strategies command fairly low and
falling levels of support; the EU average of respondents thinking their country would be better off outside being about 25%:
View attachment 454939
I'm aware of the significant anti Common Market/EEC current within the left and Labour movement and am old enough to remember that the 1975 plebiscite to endorse/reject the UK's 1973 accession was, in part, due to irreconcilable divisions within the PLP. But turning to the sections of the left with some attachment to our class that favour exit, they must find the Brexit example unhelpful to their cause. Without being able to point to one single aspect of leaving that has been advantageous to our class it seems like a hard sell, tbh.