The only way to know for sure is to get it cultured. So many thing cause bumps in this area that it's impossible for me to tell you what it is. It could be ghsv1, hemorrhoids, oil glands, etc.
The stinging when you peed sounds like herpes, but that doesn't really rule out anything else. If you still have the bumps now, see your doctor. Ask for a PCR culture to see if they can detect herpes now, even though it's been several days.
Over time, you'll be able to figure out what herpes looks like for you, and if you can get this tested and find out (it may be too late), it will help you in determining that.