I have a red rash that itches on my groin. The doc said its shingles but I'm not buying it. I think it's genital herpes? Any advice? What should I do

Both are herpes. Viruses. Herpes zoster (shingles) are almost always on one side in a band like pattern and simplex can be on both sides at the same time if occurring for the first time but if recurrent usually just a small patch. Shingles is uncommon but can occur in a 29 year old.