Ok so I liked this girl for about 4 years from elementary school and now were in 6th grade. Problem is that I'm way too scared to even talk to her!! How do I overcome my fear

Confidence
Look at the mirror and pretend that you are talking to someone.
Hope this works.

Like he said all it takes is confidence!! And don't doubt yourself. Because by the time you try to talk to her she can't be yours anymore!! :)
Hope this helps!! :) :) :) :p