Dealing with loneliness and bullying at school as a practicing Muslim with ADHD

Assalamu alaikum. I'm a high school guy at a school where Muslims are very few-just me and one other in my class, really. I do my best to keep interactions with girls brief and respectful, and I avoid the usual stuff like swearing and crude jokes that’s so normal here. But the other Muslim students I see just blend in with the non-Muslims, joking around in ways I can’t join, and they seem fine with it. I’ve been here for years and still have no actual friends. Most people act like I don’t exist, and this year is even worse. Two classmates regularly humiliate me in front of everyone or corner me alone-sometimes they hit me, even slap my face. The worst part? One of them is that other Muslim guy in my class. Lately, I tried talking to him, not to fight, but to gently remind him that harming or insulting a fellow believer isn’t from Islam. I asked if he saw himself as Muslim; he said yes. Then I asked about the five prayers-he only goes for Jumu’ah. When I mentioned the daily prayers are fard, he brushed it off, and I noticed he didn’t even know the names or times right. His friends were around laughing, like “What’s this dude asking?” It got even more disheartening. He said parts of religion don’t make sense, joked about being atheist and believing only in science, then claimed “I am God” before saying it was just a joke. He sneered, asking if I’m trying to become a sheikh. Then he brought up girlfriends-asked if it’s haram. I said yes, and he shot back, “So four wives is okay but not one girlfriend?” and they all laughed at me. I was just trying to answer honestly, and every attempt to give naseehah got mocked. I only wanted to address the bullying and remind him of our deen. After school, he left with his girlfriend and friends, and I walked home alone. I just felt like he’s a hypocrite, not really a believer, especially after those shameless jokes. School is crushing me. With his group and everyone ignoring me, plus my ADHD, the loneliness hits harder. At home, I try to share and learn Islam with my family, helping them however I can. But at school I feel like a complete failure. My grades suffer from ADHD too-weak memory messes up subjects like Math, and I’ll probably fail the next test again. I just want this to end. I daydream about school constantly, even in my sleep, and the dreams are just as miserable as real life. It’s a nightmare I can’t wake up from.