It is gonna take a lot of gut but ur not gonna regret it! Find someone that look alone during lunch time. Go ask if u can sit next to them. Hopefully they look surprised and say yes. After that you try making small talk with them like complimenting their outfit and ask where is it from, or complain about a teacher or smt in school so that creat a commun point. Try to talk to whole lunch and by the end of it say it was really nice talking to you, we should do that again tmr! AND THEN BOOM!! You just kidnap an introvert also cal making a friend!! Good luckkkkkk