Need advice guys

So hi everyone at the start of this school year i started talking to this person we have been chatting online and went on call a few times and played roblox tgt, were classmates so actually we have been talking online almost every night but idk why when were in school we barely talk to eachother like….. i talk to them but like we only talk for a short while but whenever i see them they have no problem talking to others lIKE LAUGHING AND STUFF THEYRE LITTERALY SO LOUD WITH OTHERS but when its me they dont even approach me first likeeeeeee whyyyyyyyyyy brooooo