Thinking I have a std?

Iv had sex with 2 boys I wasn't to sure with, they have slept around. We all have had that little faze we went through, we'll anyways I'm with my boyfriend for 5 years and I'm not sure what's goin on. Right now the inside of my vagina burns, last time I had this feeling I had a uti, I get them a lot after having my period which just ended a few days ago. I get this little white bumps sometimes on the top skin of my vagiba. My boyfriend has them to I'm not sure if they are just from shaving or if it's natural. I know I should go to the doctor but with my life style right now I don't have the time. What are signs of std? All I have right now is burning and painful sex.