It varies from country to country who you can vote for to oppose such legislation. You need to investigate your local representatives.
Also, the Commission only proposes legislation, it doesn't enact it. Only the EU Parliament can enact legislation. The comission is similar to the Government of most democratic countries, also in the fact that it's not directly democratically elected. However, you still have plenty of democratic control over it, just not in EU specific elections, but in your own country's elections.
Edit: mistook the Council for the Commission. Corrected in line.
Also, the Commission only proposes legislation, it doesn't enact it. Only the EU Parliament can enact legislation. The comission is similar to the Government of most democratic countries, also in the fact that it's not directly democratically elected. However, you still have plenty of democratic control over it, just not in EU specific elections, but in your own country's elections.
Edit: mistook the Council for the Commission. Corrected in line.