Hi there
Hmmmm, i dont think you have a std necessarily. I think the best thing, is to go get it checked out, if you nervous...i am not convinced you have a std....
I have herpes, and when i have an outbreak, i get itchy, painful blisters that then kind of pop...and takes a wk or so to heal, and i feel awful...but thats me, many people experience it differently, what you describe doesnt really sound like herpes, but as i said, go to you doc, if you have one, and dont worry, dont be shy, they deal with this kind of thing everyday, thats what they there for!!!
But it could also be....depends what you mean by pimples....just dont worry too much, go get it checked...and always use protection till you been with someone for long and you trust each other, and can decide together what you want...
ok;-)
Good luck!!!