An individual definition of self changes with age because

The correct answer is a to lawyers

Iwould say it's using body language that says no just because drugs has nothing to do with sex and no and and saying no would hurt someones b

The simplest unit of a nucleic acid is a nucleotide.
the proteins responsible for the bodies self defense are called antibodies secreted by b-cells.

Don't worry i been there too. i suggest you to not think about it or it will worsen, have a friend or family member talk to you when you're sad. i remember being depressed and it was a painful journey. i spent some of my time on social media and only pay attention to the content and comments my friends give, not any mean-hating stranger. remember, the world is beautiful and just think of all the things  you have yet to do. i hope you get better soon since i know that this shouldn't happen to a beautiful person like you. : )