Gallery images keep loading

Hi- noob question here but been searching for an hour…I have a page with photo gallery on my site with about 20 photos. If I click on on photo and then start going through the photos one-by-one, it start going through my whole media library and not just the pictures I have on the page. How do I keep it form doing that? Also, can I remove the header info on the media photo somehow? all the photo size info and stuff, I mean. Thx –