Opiates
Offtopic=(if you want something tasty make lemon poppy seed muffins, like OMG so good)
Answer:
I believe that it would be fear of what other people may say.
Explanation:
Personally, I would be scared that if i tell someone I am injured i will be horrified to hear that it is worse than i expected.
Herpes, gonorrhea and Chlamydia.
Answer:
C <em>cycling</em>
Explanation:
I'm saying cycling because everyone learned how to ride a bike at a young age and even if you don't know how to ride, you can put on training wheels. (lol). Hiking could be another good alternative but in case you get worn out, theres no place to call to get picked up because of bad service.