Blogtiquette

I noticed yesterday while browsing that it seems that most blogs are tutorials (and look quite professional and intricate in their designs).  It made me feel like perhaps I'm not using the correct venue to 'blog'.  It made my blog feel childish and inadequate in several ways.

Oddly enough I looked up the definition of blog in hopes that it would give me some clarity about what they actually are, but here's what it said:  

A Web site on which an individual or group of users record opinions, information, etc. on a regular basis

Hmmm, I can't say that the definition helped answer any of my questions much.

If anyone reading could answer these questions I would be very grateful:
Are blogs meant for strictly tutorials, business propoganda, and EXTREMEly intricate journaling?
Are there other people who use Blogger in the same context I do?
Where can I go to browse other people who blog like I do on Blogger? 

I guess I don't fully understand how to search Blogger for other blogs like mine.  In my college days I blogged on a another site, and I enjoyed reading and commenting on other people's blogs.  I'd like to have that same interaction here, but I don't know how.