ELI5: how do people with autism/high functioning disorder not experience the same mental health problems as those without it

For example, people with autism often have difficulty focusing or relaxing, anxiety, and other issues like anxiety attacks and body image issues. They may also develop PTSD, depression, or other forms of anxiety. People without these issues often struggle to fall asleep, stay asleep, and/or regain consciousness in a normal state, especially if they experience severe distress/unhelpful behaviors.