Ok so I'm 18,yes I have sex.I watch who I mess with though.ok so I have been noticing theses tiny bumps around my area(my vigina)im scared because I have never had them before.there like little and white and I'm not sure what they are.I have not been to a dr at all.I been checked when I was 17,in the dr didn't say they saw nothing wrong with me and they looked down there also.in then I noticed that I had like a bigger bump but you can't even tell it's there,I touched it and it feels like hard but its like in my skin.should I be worried that it could be a std?

Looks more like a yeast infection which is due to unhealthy PH levels of your vaginal fluids meaning something triggered the little white like bumps or rashes. Otherwise, this should not be limited to a yeast infection considering white lesions are triggered by other factors on the other hand for the bigger bump that feels like a hard thing... see your gynecologist soonest you can.