Hello again, Joey
It's best you ask if you don't know, so it's all good!
Look, generally if we break down the actual meaning of the word 'fursona', it is derived from the words 'furry' and 'persona'.
A persona is how you represent yourself. For example online. A furry persona, such as an anthropomorphic character is a fur-sona. As such you also have scalesona, a persona covered in scales, such as a dragon or lizard.
You can represent who you really are and just simply change the 'appearance' or 'look' of yourself online; We all know I'm not a real dragon here
but how I am on these forums is how I am in real life as well.
You can also represent a specific side or traits of yours and build a fursona around that.
Thus however the word itself furry-persona by itself means that, the word fursona has taken on various different forms and can mean something else to everyone separately. Though generally a fursona is how you represent yourself to others, in whatever shape or form this may be with whatever reasoning behind it.
As for fursona's being OC's (original characters) of their creator?
That doesn't have to be the case, but is usually very common.
People also work with adopting a designed character, be it via an auction, commission, or otherwise. I have known a few (also in real life) who are furries but could not draw or did not -in fact- have any imagination how to design their fursona
So they let someone else come up with something for them.
But generally something they can look at, something that represents them in whatever way.
Some people have a stronger relationship to their fursona's than others. Others have it "just for fun", but for some it's something a bit more than that.
To me, I have a strong connection with every character I draw and design. Ventus Fall (my main and most common fursona) represents me the best. She is me. I focus on art, so does she. I like dragons, she is a dragon. Etc.
Interesting drawing you made there!