Guys I'm starting to freak out I have three SCARS on my back and I didn't even notice?

You might have caused them when you were younger and forgotten about it, I have scars on my hands and legs and I have no real idea how I got them... some of them needed stitches! I know I did a lot of outdoor stuff when I was younger, climbing, hiking etc but I have no recollection of the pain, the incidents or getting the stitches.
The same is probably the case with you but because they were on your back you've never noticed them until now, we don't usually look at our backs on a regular basis.