No, they're not exactly the same. DC Comics is the original source of the characters and stories, while the DC Universe is a broader platform that includes various media adaptations and related content.
In DC Comics, 'DC' stands for Detective Comics. It was originally the name of a comic book series that later became the basis for the entire DC universe.
DC Shoes and DC Comics have no direct connection. DC Comics is famous for superhero stories, while DC Shoes focuses on producing shoes and related apparel. There's no ownership or business link between them.
One option is to visit your nearest bookstore that sells comics. Another way is to check out dedicated comic websites that offer a wide range of DC Comics. Libraries sometimes have them too.
I have no idea which DC Comics character you could be. You might need to describe your skills, backstory, or any special abilities you think you have that might match a character from DC Comics.