How do I stretch out my vagina for sex?

I'm a virgin and I've tried to have sexx with my boyfriend twice already but his penis won't fit. It won't fit in at all not even the tip. It hurts extremely bad when he tries to push his penis in. We've tried lube and it doesn't help. Is there anyway I could stretch out my vagina so I can have sex with my boyfriend.
How do I stretch out my vagina for sex?
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