I have had an itchy, burning feeling around the vagina opening for about a week now. I got off an antibiotic like a month ago is it a yeast infection?

Yeast seems likely. These symptoms are typical for vaginal yeast infection, which can be triggered by antibiotics. So yeast seems a good bet. Best to see a doctor, but if you want to try an over-the-counter treatment, it would be safe as long as you see a doctor promptly if no improvement. Look for a vaginal cream with active ingredient ending in "azole" (miconazole, clotrimazole, etc).