Irritation please help

So I just started birth control and since I’ve started I’ve been having sex. My partner is clean but EVERYTIME we have sex either one of my vagina lips gets swelled up or it’s like some of my vagina tissue rips off. When I pee it burns because when the pee hits the opening of my vagina idk. But anyways the opening of my vagina is a little irritated and itchy at sometimes & ive been noticing it’s been dry lately. And I’ve also noticed little white yellowish flesh like dots on the opening of my vagina and I’m really scared it’s like a std or something 😭

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