Help ~ VERY basic questions about Instagram

I created an account on Instagram.
When I log on I see pictures from other people.
Is this just random stuff served up by Instragram when you log in?
Or have these intragramers chosen to follow me?
Why am I seeing these?
If people follow you then their images appear when I log-in?
How do I clear them out?
When I go to my account I see 59 Followers and 179 Following, I haven’t Followed anyone, how did this happen?
Is my account hacked?
Whats’ the story?
All guidance/clarifications will be appreciated.

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