What is the occurrence in adolescents where they tend not to think that death can happen to them, and, therefore, they get involved in risky behavior(s)?

The answer to this question is "Personal Fable".

Personal Fable is the occurrence in the adolescents where they tend not to think that death can happen to them and therefore they get involved or engaged in any risk behaviors. This a belief of adolescents telling theirselves that are special.