Ive been on antibiotics for 5 days now for uti and have burning most the time and after i urinate but not why urinating. my vagina skin feels irritated inside. is this the antibiotics?

Use the warm sitz bath with added baking soda 15 minutes for every 6-8 hours in the next 24-48 hours. If symptom does not improve, yeast vaginitis can't be ruled out if you are a diabetic or if you can see the whitish spots in your vagina.

from your description it sounds more like irritation on the outside and not an uti. uti would cause burning only in the urinary passage way and findings in urine indicating infection, clean the area gently and apply cortisone ointment for a few days. If not better pl see your doc and be sure the area is examined