It depends on the anime. If it's not some weird shit that you could find on pornhub then don't do it XD if it's something sane like SwordArt Online then your fine :)

I am very sorry this happens. Do you have a parent you can speak to about it? They will understand.

It's normal. Lots of people do it, like singing dubstep. BOO BWAGH BZ BZ DREOOUGGHHH etc.

Could be a fever. I had that problem. It lasted a day but I was fine in the morning.

Thats uh, not, very normal..

TBH, I sometimes get sexual thoughts about a character from a video game I play. (If you wanna see what she looks like, google "Castle Clash Succubus") and it's not super unnatural. I have heard ...