Do I have a yeast infection?

I’ve been sexually active sleeping at my boyfriends for 4 nights straight. I started itching by the 2nd or 3rd time having sex. The itching got more intense and my vagina started puffing up from rubbing it. I’m leaking a yellowish liquidy discharge with a little odor. My boyfriend complained I gave him one, days after I started, because he started itching and his balls are peeling. Is this a yeast infection or STI?
Do I have a yeast infection?
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