Burning and Pain

So my boyfriend and I have been together for a year now.... we use to have incredible sex with no problems (condom used) then I got on birth control and we started to have sex without the condom... but it's starting to hurt by the opening when we switch positions from missionary to anything else... the other day it was so painful that we had to stop within 5 minutes... we have been using lube because we read that it would help... but it burns to pee after sex and it burns during sex... the next day after we had sex and had to stop after 5 minutes, I started to be super itchy down there... so I changed my underwear and took a shower.... but when I peed it burned bad and my clit can't even be touched. If it's even slightly touched it's instant pain.
Any ideas of what's wrong?? 
(Also we both have never slept with anyone else unprotected)