Complaining is a choice too. It just likes to dress up as an opinion.

Complaint feels like analysis because it is often accurate. The teacher may genuinely be unfair, the schedule may genuinely be bad, and describing that out loud is not wrong. What makes it a choice is the repeat: the tenth time you say it, you are not informing anybody, you are running a loop that makes the situation feel more permanent than it is.

Notice which complaints you have made more than twice. For each one, either do the smallest thing that could change it or stop narrating it.