How it feels to have an anxiety disorder

Calm down bro. *insert troll face here

Yes it can be stress induced.

You would know if you have anxiety. It's not the same as being nervous, you become so nervous to the point where you can't think straight, you're shaking, possibly mumbling as well... It's not just "Oh man, i don't think i can do this" its "Oh man i am going to fail this and drop out of school and not get a job and die alone as a filthy hobo from some crazy painful disease!"

Why the downvote you can develop anxiety from being in a stressful situation long enough, existing minor anxiety can also be worsened by stress.