Maybe try protesting the people you're actually mad at.
We understand that it must be frustrating to feel like your voice isn't being heard. Some adults handle this better than others, but it's college kids experiencing it for the first time in their lives who usually give us the worst examples of how to behave in these situations. For example, here is a video of a group of kids protesting fee increases by blocking the highway while people are trying to get to work. People who have nothing to do with it and who might have otherwise even been sympathetic.
The extent to which the protesters have failed to garner public sympathy is evident in the reaction of the one motorist in this video.