How Do I Change The User's URL? Would like it more user friendly.

Question

I would like ot have my urls for users like this

mysite.com/username

right now the pages are setup like that

mysite.com/page

and the users are like this

mysite.com/user/username

I would prefer it like this

mysite.com/pages/pagename

and i would prefer all users to be able to access their profile by going to

mysite.com/username

 

does that make sense?  any way to do this?

 

thanks much