Dealing with teasing about maintaining chastity

Assalamu alaikum, I’m reaching out for some guidance on a personal struggle. Growing up in a village, I was around kids who got into bad habits, and I fell into some regrettable actions between 4th and 7th grade. I had relationships with a few girls back then, and we did things that were sinful, though I never actually had intercourse. Alhamdulillah, when I learned these acts are haram, I stopped immediately and haven’t gone back. I’m in 12th grade now, and some classmates and people online make fun of me for still being chaste. It’s tough to handle, and I’d appreciate any advice on how to deal with this situation while staying true to my faith.