I have pain in my lower right abdomin.. I have read about appendicitis and I learned Ionly have one of the symptoms... Which is the pain... Should I still go to the E.R.

Only you know the type of pain, and how bad the pain is. No one here can diagnosis you over the internet, Yes it is always a good thing to go to the doctor when in doubt.

Perhaps a Urgent Care Center, or other 24 hour medical center, it would cost you a lot less.