BYM: I think that’s a pretty fair assessment. Being in the middle is often times considered desirable, while being on an extreme to either side is sometimes seen as undesirable. “Normal” to many or most means “the middle.” Everyone likes to consider themselves normal, and place others based on comparison to themselves. That being said, nobody is “normal.” Normal usually = boring 😛
Keep up the running though, it is so good for you. Another thing to keep in mind is that it is best to run either on a treadmill (which I hate), asphalt (streets), or paths/trails. Running on concrete sidewalks is terrible for your joints, particularly ankles and knees. Asphalt and paths/trails (and obviously treadmills) provide more “give” and bounce to help absorb the shock.
If you’re thinking about training for a marathon, I say go for it! It’s an accomplishment you will never forget, and it will really show you that you can do anything that you work at. Achieving a goal like that is intensely satisfying and boosts self-confidence and image. Someone pointed out Hal Higdon’s program, and I’ll second that recommendation. You can access basic training programs online, or he has a book out called “Marathon: The Ultimate Training Guide” which is very thorough and gives you a ton of useful and necessary information.