Communication, protecting your peace vs aggression

Okay so like, I recently looked at a Tik Tok right. It was about how communicating directly can be often viewed as aggression. It made me think about how I handle things in life yk. Its been  a habit of mine to disregard and shut people out with aggression lol. Being passive aggressive. I've always kinda kept my mouth shut about things that bug me. Think before I speak, but I never end up speaking.  I'd like to be more direct honestly. Like obviously not rude, but direct and mature. Communication has kinda gone out the window these days with fear of offending someone and honestly it's whatever. Certain things you'll feel the need to communicate, I can't control how people really. Humans are complicated, but I want to do what's best for me, but still being cordial to others as human beings. Not everything is a personal attack, I'd like to unlearn that habit that many people have. I've fallen victim to that mindset a couple of times myself.