If you haven't had any kind of sexual relationship ever, it can't be HIV. It doesn't matter how they did the test - you have no risk for it, so you didn't need to test. I'm surprised anyone tested you for it.
I don't know if it's the lighting, or the photos were taken on different days, but in some you look like you have ulcers on your tongue, and others it looks like it may be thrush.
I think you need to show your doctor all these pics, and let them decide, since it looks so different in one pic to the next.
In the meantime, drink plenty of water and ease up on any acidic foods you might be eating.