I think you have chafing and irritation. Fungus is possible too, but seems less likely, from your description. Fungus, by the way, is not readily contracted from other people. Nothing in your description suggests herpes. Rather than surf the web, you should let a doctor have a look, so you can be properly treated and stop worrying. I don't think you have an STD, and a quick exam in person should establish this, so you needn't go into detail about your recent sexual history.
As to feeling guilty and scared about sex in general, that's a larger issue, and an important one, that you may be wise to look into exploring.
Also right now I have a sore throat and my lymph node is inflamed in my throat area.
I have noticed that there are more red splotches on my inner thighs after my run when i was in the gym shower. Could it be folliculitis or contact dermatitis? Still haven't seen any blister-like formations after 2 days. They're mostly red splotches, very small, with some about 1/3 the diameter of the eraserhead.
What would you recommend for treatment? right now i am using lamisil and gold bond. should i swtich to a steroidal cream? how about aveeno lotion?
Irritation seems most likely. I'd use Aveeno, and follow my other intructions. The sore throat and nodes are probably something else--have them checked if they bother you.