Would You have been able to use civil disobedience and non-violence?

I do not think that I could have changed america with civil disobedience. If a law was unconstitutional or injust I could not deliver a message of protest in peace, when the police didn't care and used violence to stop the protest. If people used force to stop my protest I would do nothing else but use violence back at the police. PEACE WILL JUST BE IGNORED.