The last few weeks ive noticed that three-four girls laugh at me. When school is over, they ride the bike and i walk to the bus station (we need to go the same way) Im an observant person, and i noticed that whenever i walk to or from the bus station, when they're about to pass they stop talking and when they almost pass me, they laugh. In the start i didnt think it was because of me, but now im sure its me. ive also noticed it when i was about to present in a group, and walked up in front of the class, i spat a gum out and they looked and laughed at me. I dont know if that was me though. Today after two of the girls rode their bike past me and laughed, while we were going up the stairs a bit later on in the day, one of em looked back and made eye contact with me. After she looked at the other girl, maybe said something and again laughed.
I dont know what theyre laughing about, and its annoying because i dont know if did something wrong, embarrassing og said something.

Personally I think ur best bet is to ignore them and hopefully it will die down and they would get fed up of this, but if it escalates I think asking them why they are doing this so u don’t need to worry about it anymore