i really need advice

Okay, so there was this guy (Austin) I really liked in april/may and we were snapchatting from January to early June. We had a huge thing going on like dating but without the "title." We would be flirting every day since the middle of February. He asked for nudes and I stupidly sent them to him. During the beginning of June he sent them out to everyone. Pretty much ruining my summer. I lost all of my friends except for one.

I knew that his twin (Adam) brother ran cross country and I'm on the swim team. I get to the school the same time that the twin is almost finished with his practice. I can handle seeing the twin everyday but today I saw the guy I used to like, (Austin) when I wad walking in to the school. Austin is running cross country now. So that means every day I have to see him and be reminded of what I went through. I have no idea how I'm going to handle that. Especially if more then half the guys on the cross Country team have seen me naked. I really need help and school for me is starting Monday. I'm freaking out. The majority of guys in my grade have seen my nudes. If you can give me advice on how to start feeling more confident i will be extremely grateful.