Distrust in people...

About two months into my first year of middle school, a guy I barely knew, whom a close male friend introduced me to, confessed his feelings. I didn't like him and we didn't know each other well, but he confessed. I'm the type of person who can't easily say no, so I ended up dating him, but I just couldn't develop feelings for him. I became scared and started skipping school, taking a six-month break. Around November, when I finally went back to school after a long time, a friendly and cheerful girl I knew had quit. She was a really nice and funny person, but she was being bullied by a female friend I'd known since elementary school and some classmates. Even our kind homeroom teacher sided with the bullies. Honestly, everything felt so scary. I asked the female friend I'd known since elementary school, 'Is it true you were bullying [her name]?' She replied, '[Shrugs] Who knows lol' and then asked, '[When are you coming to school next? lol]'. I was so terrified that I might be targeted next, and I still haven't been able to go back to school, even now in my second year of middle school. I've thought about going back for high school and my future, but I'm hesitant and scared, wondering if I can truly trust anyone.