OP:
How about answering a few questions:
- Which Mac do you have (MacBook Pro, MacBook, something else?)?
- What year made (it's "new"?)?
- Where did you buy this? (Apple Store, some other store, directly from Apple, etc.?)?
- Do they have brick n mortar Apple Stores where you are?
If they have REAL Apple Stores where you are, I suggest you make an appt at the genius bar, take it in, and have them "clear it" for you (put it back into an "out of the box" state).
Then... start over.
And some advice for the future:
DO NOT put a "firmware password" onto it
DO NOT encrypt the internal SSD
Why not?
Look at "where you are" right now.