Exactly how bad is my vision?

If your only 16, odds are your vision won't level out until your in your early twenties. If you wear contacts, this is a good thing. It can actually slow the progression of worsening vision. It won't stop it from getting worse, but it may not get as bad as if you were wearing gles full time. I have seen people with alot higher prescription than yours. I'm one of them and my vision finally leveled off in my twenties.