Should I be concerned or am I over-reacting?

I went in for my yearly exam and I had my pap done, I have always had normal paps. This time I didn’t hear anything for a month, and I got the card with my results in the mail today and instead of the box for normal being checked, the box saying “changes, which require further evaluation to rule out or establish any significant diseases, please call to schedule an appointment for evaluation, was marked, and I am freakin out. Also, the word “colposcopy” was written in. I also haven’t had a cycle in almost 6 months, which was the main reason I went in for a check up. I am really scared could anyone out there let me know what this means? I mean they would call me if there was cancer or something found right? I am 22 years old.