HELP! New, sudden pain during sex

C
I've never really had a problem with sex before but now it hurts on penetration. Like as he goes to put it in it's like losing my birginity but worst? It happened all of a sudden like I'm with my boyfriend and we've had perfectly comfortable sex before. He suggested I get checked for like any STI's or vaginal infections but surely I'd have had this before if it was an STI? Should I go to the doctors about this? It's like a sharp stinging pain but it's not subtle at all, it really hurts 

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