yes @
Dominate
you can go to a university straight out of HS, declare a major right away, and begin working towards it. there are a certain amount of general ed credits (math, english, etc.) you have to complete along the way, and are usually pre-requisites for higher level classes in any field, but yea - as long as you complete your specified major credits along with your gen eds, you are granted any Bachelors degree you want in 4 years or less out of HS
the reasons people usually go to colleges (usually community colleges, lower tier schools) are either because they're vastly cheaper (and a good place to get gen ed classes done), they did poorly in HS and couldn't get into an accredited university, or because they just want an Associates degree to enter the workforce ASAP.