i was also skinny for the majority of my young life, I was once reffered to as a person who would always be skinny for the rest of my life by a coach which pissed me off. But that was simply my reason for working out.
I guess i like the concept of being able to defend myself against most people, i have been in situations where i havent been able to while with a loved one, which is scary. I also like the way i feel during. Plus cycling helps me stay dedicated because i dont want to waste my money if im just guna **** it up.