Hi - around the same age as you I started getting what I call 'paranoia anxiety'. This is exactly what is happening to you right now - for the record and to calm you down, no one has been arrested for willingly SENDING nudes of themselves. Basically what I am trying to say is - I'd be highly surprised if you were arrested for doing this. I don't know what country you are in, but this is not illegal in any Western countries to what I know.

Your anxiety is lying to you and telling you that this is a threat. Is there anything else going on in your life that is causing you stress (e.g. workload, relationship issues, family issues)? I find that when I am already stressed about something, anxiety will find a way to make me feel paranoid thoughts. Long story short, I went to therapy and I don't get anxiety paranoia anymore because I've learnt to manage it. I would suggest you go and see someone to help you get control of these thoughts. I didn't go and learn to manage them until I was 22 and by that time they were taking over my life. Don't let that happen to you! Therapy is a godsend and will definitely help. Feel free to DM me if you want to talk more about this.