Your girlfriend is an abuser.

So, let's begin. You met a girl who's 16, meaning you're younger than her, and she found someone younger. Somehow, at 16, she already has a good job working remotely from her home. And you lived with her. She was always criticizing you, your hobbies, your appearance, even though you're very handsome, your character, your accomplishments, and your personality. She ridiculed you in front of everyone, isolated you from them with the phrase "they're a bad influence on you," always shifting the blame, "You drove me crazy!" and things like that, and sometimes even used force when you didn't listen (and not just holding you back), she was always following you, telling everyone your personal secrets and ridiculing them, and manipulating you under the pretext of anti-animation (you get the idea). You thought it was just her character and tolerated it all.