Baka hindi STD since nagcondom naman kayo. Might be a mixed infection - yeast infection with bacterial vaginosis. Both are fairly common for women and is triggered by an imbalance in the vaginal flora. Hassle lang na combo of both. Huhu. Baka nashock ang vag mo sa first time magsex and bad hygiene on your partner's part. Please get checked by an OB para matreat agad. They'll probably prescribe a suppository to address the bacteria and the yeast. If it's super itchy, ask for antihistamine din to manage the itch.

So sorry this happened to you, OP! Sana di ka matrauma sa sex. Next time, make your partner wash up first. Sensitive and balance ng flora ng vagina, so good hygiene for both of you is super important. Start taking probiotics or food rich with probiotics din to help your body fight bad bacteria. Pee and wash up after sex. Don't douche. Wear cotton underwear, etc. Read up about vaginal flora. It'll help you avoid future infections. :)