Why do i say the wrong name like if im going to ask someone something i will call them the wrong name by accident is it something to worry about?

It could be simple Anxiety but it could have other basis as well. First discuss it with the PCP and if not resolved consider Psychologist/ Neurologist Consults. The problem can lead to errors of identification and even affect one's Studies and Working with people.

At the age of 20, paraphasias, and dysnomia would be due to potential developmental causes. Suggest seeing a speech therapist and have a thorough evaluation, and perhaps a course of therapy, assuming no progressive changes. You should contact your doctor and ascertain whether there is a medication, or recreational drug influence. Brain imaging may or may not illuminate causes.