Yes, you should get over it. Let me elaborate. Once you have enough strong beliefs (which you certainly should), the stress of the terrible things happening in the world around you will weigh down on you and can even be psychologically damaging. For example I am very strongly opinionated about FOSS, veganism, anti-capitalism, environmentalism, anti-consumerism, and more. I don’t have the energy to worry about them, nor the time to solve any of them alone.

The solution is not to let go of your opinions nor to dampen your emotions, but to remind yourself that there is a limit to what you can do, but that by being vegan you have made a huge step in the right direction and are setting and example for others. Your presence, without a word, causes people to question their own action in a positive way.

All that said, given the opportunity, such as if someone questions or challenges you, take it and speak your mind.