First of all, we miss the right of self-determination (= the process by which a country determines its own statehood and forms its own allegiances and government (The New Oxford Dictionary of English)) which is recognized by UN's resolution 1514 of 1960 as a fundamental right of the peoples of the World.
But Spain has damaged Catalonia in many other ways. Economically, the people in Catalonia has always been overtaxed while the Spanish Administration has always invested less in Catalan Public Services. Culturally, we should mention how our language has been excluded, banned, run down and how our culture has been despised and overwhelmed.
Finally, we should not forget the thousands of Catalan patriots that, since 1714, have been imprisoned, tortured and killed for asserting the right of our country to be free. Let us mention just two of them:
Rafel de Casanova, Prime Minister of Catalonia and chief defender of Barcelona against the Spanish Army, killed on September 11th, 1714 during the Spanish assault to Barcelona.
Lluís Companys, President of Catalonia, captured by the Nazis and killed by Franco's fascist government on October 15th, 1940, after a mockery of a trial.