"Going against the grain" is an idiomatic expression that means acting or behaving in a manner that is contrary to what is customary, typical, or expected within a particular context or society. It implies going against prevailing norms, conventions, or trends.

In the context of being an individual and maintaining mental health, "going against the grain" can be interpreted as the act of asserting one's unique identity, beliefs, values, and preferences despite external pressures to conform. It involves being true to oneself even when it might be easier to conform to societal expectations or peer pressure.