Std? UTI? Or normal?

Recently Ive been freaking out, because I have had the really strong urge to pee, but I run to the bathroom, then I all of a sudden dont anymore. Or sometimes its just a little tiny bit, and i have thing burning/tingling sensation. 
I went to the doctor and got tested for a UTI and it came back negative, and there is no chance of it being an STD....
So what are the possibilities? Help!