Is it wrong for me to have a crush on someone I met 6 years ago, I feel like it will never go away.
That depends, does it make you feel bad that you may never get over this crash?
It has left scars on my heart.
You're allowed to have crushes on people, but at some point it is time to move on. You should look for a relationship with someone who is available to you.
It's just a crush.
I understand that is just a crush, but it seems to be really affecting you mentally. I think the best thing for you is to move on and try to find someone else you are romantically interested in.