Next time a negative situation or issue arises and you’re tempted to brush it under the rug, stop. Don’t brush it under the rug where it’s still there, just hidden. Resolve it, brush it into the trash and then take the trash out.
Suppressing your feelings regularly will only result in an emotional overload. Bottle them up for too long and they explode. Avoiding conflict and brushing things under the rug does not mean they’ll go away, it means they’ll come back later, but with firepower behind them.
Teachers won’t always like your papers. Friends will be jerks. Bosses will ask challenging questions and professors will give constructive (but not always) criticism. Learning to accept this, and to deal productively with healthy conflict, will help you be more resilient.
Offering reconciliation in conflict can be more important than actually coming to a solution; it shows the person how much you value the relationship. Clearly and calmly communicate what you want from the situation and listen to their views. Understand what counts as a ‘win’ from both sides.